ERT-630 Added new version dialog
ERT-630 Added version dialog to menu
ERT-630 fix for OS X
ERT-630 fix for OS X
ERT-630 dialog tittle change
ERT-630 Added gpl info in about dialog
ERT-630 Reformatting and adding Git commit hash
Merge pull request #515 from iLoop2/ERT-630

Ert 630 Add an "About" element in the help menu - similar to ert's "version info"