Fix project selection bug in navigator

Fixed a bug with project selection when the DS project navigator was
closed and reopened because even when no items were selected the
previously selected projects were still cached in the Activator. Now
when disposing the navigator selected projects are properly cleared out.

Change-Id: Iae828189f9bac97b247d937e7be3cdb24d875cb2
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Use StatusManager for some errors

Added more details in some exceptions using the StatusManager.

Small changes in ResultsView: fixed a bug when the results.ser file was
not found and the update process was not interrupted causing another
unnecessary message dialog to pop up.

Change-Id: I235ca539895662c3045e03ead858a918a17e76c4
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Refactor logging format and messages

Change-Id: If85e10ed1496da0111ad195eff634c45bb0fa5a8
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>
Merge pull request #134 from DenisKnoepfle/master

Refactor logging format and dialog error messages