Merge pull request #84 from krauswg/master

Saving the policy configuration now marks the spreadsheet as dirty
Fixes #85
The loading of the findings is triggered after the workbook model is created and the current workbook is set.
Merge pull request #86 from tothfn/master

Fixes #85
Changed the method which adds violations to the marker icons
Fixed the adding of the violations to the marker icons
Fixed a bug
Fixed several bugs
Fixed a bug on the marker icons when a selected finding gets switched between tabs
Changed the color of archived findings and the icons for later and archive
Fixed the green border selection in the ignored, later and archive tabs.
Merge pull request #89 from tothfn/master

Several bugfixes
A warning message is now shown when a thousands separator is used in a number https://github.com/kuleszdl/SIFEI/issues/91