commitmonitor Code

Implemented issue #110: Displaying connection error notification in systray

* show notification if an error occurs while checking a repository for changes
* show repositories with errors in gray text in the tree control

Implemented issue #94: Enhancement: URL for browsing differences with revisions numbers

* add edit box for the web viewer url to the url dialog
* replace the strings in the url:
%revision - replaced with the new selected revision number
%url - replaced with the url of the project
%project - replaced with the project name
* open the browser with the web viewer url when requested by the context menu

Fixed issue #98: No initial selected project

Replace SetWindowText() with SetDlgItemText().

Re-set the currently selected item after refreshing the view.

Fixed issue #90: Currently selected list element looses focus when new commits are detected

Ensure the selected item is visible when navigating with 'n' or 'b'.
This adds to issue #89.

Fixed issue #89: Navigating with key 'n' doesn't work
If no more unread items are available, 'n' goes to the next item.

Bugfix: Clicking on the "Show Diff" button did not respect the setting "Use TortoiseSVN for showing diffs" but always unconditionally used TortoiseSVN.

Additionally: Two functions (OnDblClickListItem and DoCommand) which interpreted the setting have been refactored to use the new ID_MAIN_SHOWDIFFCHOOSE command.

Add an update notification if a newer version of the CommitMonitor is available.

Implemented issue #72: Add fourth column showing start of commit message