Possibility to increase the number of vectors to be computed

• possibility to change nvec after a restart to ask for more vectors
• possibility to specify the number of converged vectors to increase the convergence threshold on some vectors

doc/code.tex

 The {\sass} code~\cite{p:relaxse}
-does a fully-decontracted Multirefrence Configuration
+does a fully-decontracted Multireference Configuration
 Interaction (MRCI) calculation using one of the following methods
 \begin{itemize}
 \item {\bf SAS+S~:} single excitations on all determinants of a  reference
@@ -17,15 +17,15 @@ Interaction (MRCI) calculation using one of the following methods
 
 \item {\bf MRSCI~:} single excitations on all determinants of a selected reference space
   (included into a formal Complete Active Space);
-\item {\bf MRSDCI~:} single and double excitations on aall determinants of  selected reference space
+\item {\bf MRSDCI~:} single and double excitations on all determinants of a selected reference space
   (included into a formal Complete Active Space);
 \item {\bf CAS+S~:} single excitations on all determinants of a Complete
   Active Space;
 \item {\bf CAS+SD~:} single  and double excitations on all determinants of a
   Complete Active Space;
-\item {\bf CAS+DDCI~:} single  and double excitations from the Difference
-  Dedicated Configuration Interaction space~\cite{DDCI1992,DDCI1995,DDCI1997},  on all determinants of a 
-  Complete Active Space. 
+\item {\bf CAS+DDCI~:} selected single and double excitations on all determinants of a 
+  Complete Active Space, as defined in the Difference
+  Dedicated Configuration Interaction space~\cite{DDCI1992,DDCI1995,DDCI1997},
   
 \end{itemize}
 
@@ -33,32 +33,32 @@ Interaction (MRCI) calculation using one of the following methods
 \subsection{The orbital classes}
 The code uses a partition of the orbital set into 7 different types
 \begin{description}
-\item[FROZEN]~: (keywork NOrb\_gel) doubly-occupied orbitals that are frozen in the
+\item[FROZEN]~: (keyword NOrb\_gel) doubly-occupied orbitals that are frozen in the
   calculation. In the present version this number should be the same as in
   motra.
-\item[OCCUPIED]~: (keywork NOrb\_occ) doubly-occupied orbitals from which only one hole can be created in the calculation.
-\item[LIGO]~: (keywork NOrb\_ligo)  doubly-occupied orbitals from which two holes can be created in the calculation.
+\item[OCCUPIED]~: (keyword NOrb\_occ) doubly-occupied orbitals from which only one hole can be created in the calculation.
+\item[LIGO]~: (keyword NOrb\_ligo)  doubly-occupied orbitals from which two holes can be created in the calculation.
   These orbitals are typically the occupied ligand orbitals bridging the magnetic interactions.
-\item[ACTIVE]~: (keywork NOrb\_act) active orbitals. When the CAS keywork is
+\item[ACTIVE]~: (keyword NOrb\_act) active orbitals. When the CAS keyword is
   given the the METHOD the whole Complete Active Space is generated. When the
-  SAS keywork is given the the METHOD only a selection of determinants within the CAS is generated~:
+  SAS keyword is given the the METHOD only a selection of determinants within the CAS is generated~:
   \begin{itemize}
   \item all determinants required for building the $S^2,\, S_z$ spin configurations associated with each configuration provided in Ref0,
   \item all single excitations within the CAS on each configuration provided
     in Ref0, and their associated determinants required for the associated $S^2,\, S_z$
     spin configurations.
   \end{itemize}
-\item[LIGV]~: (keywork NOrb\_ligv)  virtual  orbitals on which two particules can be created in the calculation.
+\item[LIGV]~: (keyword NOrb\_ligv)  virtual  orbitals on which two particles can be created in the calculation.
   These orbitals are typically the virtual ligand orbitals bridging the magnetic interactions.
-\item[VIRTUAL]~: (keywork NOrb\_virt) virtual  orbitals on which one particule can be created in the calculation.
-\item[DELETED]~: (keywork NOrb\_del) virtual orbitals deleted in the
+\item[VIRTUAL]~: (keyword NOrb\_virt) virtual  orbitals on which one particle can be created in the calculation.
+\item[DELETED]~: (keyword NOrb\_del) virtual orbitals deleted in the
   calculation. In the present version this number should be the same as in
   motra.
 \end{description}
 
 \subsection{The different methods}
-The different types of calculations can be done with a proper combination the
-the keyword METHOD (ACS or SAS + DDCI or S) and the setting of the different class of orbitals.
+The different types of calculations can be done with a proper combination 
+the keyword METHOD (CAS or SAS + S, DDCI or SD) and the setting of the different class of orbitals.
 For instance \\[2ex]
 \begin{tabular}{l|l|ccccccc}
   \hline   \hline
@@ -88,8 +88,8 @@ For instance \\[2ex]
 \end{tabular}
 
 \subsection{The determinant classes}
-The \sass\ code partition the determinants into 9 classes, defined from the
-number of holes in the OCCUPPIED or LIGO and the number of particules in the LIGV or VIRTUAL classes of orbitals.
+The \sass\ code partitions the determinants into 9 classes, defined from the
+number of holes in the OCCUPIED or LIGO and the number of particles in the LIGV or VIRTUAL classes of orbitals.
 
 {\small
 \begin{minipage}[t]{0.490\linewidth}
@@ -107,7 +107,7 @@ $D_{00}$ & 0 & 0 & n & 0 & 0 \\
                           & 1 & 0 & n & 0 & 1 \\
  \hline 
  %
- \multirow{4}{*}{$D_0^2$} & 0 & 2 & n & 2 & 0 \\
+ \multirow{4}{*}{$D_{02}$} & 0 & 2 & n & 2 & 0 \\
                           & 0 & 2 & n & 1 & 1 \\
                           & 1 & 1 & n & 2 & 0 \\
                           & 1 & 1 & n & 1 & 1 \\