commitmonitor Code

When selecting a project in the tree control and filling the revision list control, ensure that the first unread item is visible.
This implements issue #31.

Improve the diff function if TortoiseSVN is installed:
* if TSVN is installed, add a second entry to the log list control context menu for diffing with TSVN.
* if TSVN is installed, the default diff uses TSVN.
* to get the unified diff again (if TSVN is installed), the log list control context menu entry "show unified diff" has to be used.

This implements issue #13 (kind of).

If no unified diff viewer is specified and TortoiseSVN is installed, use TortoiseSVN to do and show the diff.

When selecting a tree item which has no error, remove the list control info text.

Make Ctrl-A select all entries in the log list control.
This closes issue #18.

After removing the last monitored repository, deactivate the 'remove' button and clear the log list.
This fixes issue #24.

pass the authentication information before attempting to fetch a diff.

Select the first url which has unread items when the main dialog is shown.
This implements issue #12.

Instead of showing a message box with the latest error message, show the error text in the revision list control. A doubleclick on the error message clears it and lets the user see the previously fetched log messages.

This implements issue #3.

Store both the window and client width/height in the registry since we need both to properly restore the window size and position.