commitmonitor Code

(Closes issue #281) : Single click on tray icon option

(Closes issue #275) : Ability to monitor commits of certain users

* add a new section in the URLs dialog which takes a list of users to include

(Closes issue #163) : Group popups (should wait some seconds for grouping several commits)

Fix compiler warnings.

convert tabs to spaces.

(Closes issue #103) : "Automatically create diffs of commits" was useful option

(Closes issue #234) : Remember last selected project

(Fixes issue #225) : Typo while checking repositories

(Closes issue #205) : Enhancement: Refresh single node

* introduce variable for single url. In the refresh thread, only work on that url if it is set.
* add menu for "check now" to the tree view items which only check that selected item.
* rename "refresh all on next check" to "refresh all".

Only show authors for new commits.