Bug fix that was making the sphinx-build very slow

Many bug fixes related to ud

The temporary job script files are now also saved when running a job
from the GUI

Added a specific logfile for each launched job
Improved the JobControllerPanel
Removed the global logfile toolbar button
Removed the 'info' JobStatus entry
Removed unused Plugin.has_parent method
Bug fixes

Moved the converters to a specific menu
Reintroduced the __setitem__ for the ElementsDatabase
Reintroduced and refactored the PreferencesSettingsDialog
Refactored the PeriodicTablePlugin
Added new icons
Refactored the Icon class

directory
Bug fix due to the change from configurators to settings class variable
for IJob derived classes
Reintroduced and fixed JobHelpFrame class

conflicts
Refactored many GUI related module to make the main app restartable