Merge pull request #760 from mtseu/backlog-186-master

[BACKLOG-186] - Need to provide user with a decent message when the repo...
[BACKLOG-179] Errors executing JobEntryTrans/JobEntryJob after export/import
Merge pull request #765 from mdamour1976/master

[BACKLOG-179] Errors executing JobEntryTrans/JobEntryJob after export/import
BACKLOG-337 - fix for unit test
[BACKLOG-684] - Updated documentation header from 5.1 to 5.2
Merge pull request #771 from brendan-lynch/master

[BACKLOG-684] - Updated documentation header from 5.1 to 5.2
Merge pull request #768 from SergeyTravin/BACKLOG-337T

BACKLOG-337 - fix for unit test
[BACKLOG-186] - Need to provide user with a decent message when the repository is not availabe

changed error message according to UX feedback
slightly changed logic for process launch of Repository Explorer failure
added failure processing for JobDialog: extraTabs