commitmonitor Code

* Add Exit button to quit the application
* Closing the main dialog with the red X doesn't quit but hides the main dialog
* Pressing ESC also hides the dialog
* Change the OK button to "Hide"

Make ESC quit the diff viewer, if the find window isn't visible.
If the find window is visible, ESC will first close that find window.

Only send notifications to the main window if not just the revision number changed but also at least one log message could be fetched. The revision number can change even if there are no changes to the specified URL!

Add tooltips for some controls in the url and options dialog.

Allow disabling the notification sound completely.

Add some information about what is done in the progress dialog when fetching the diff.

Fix label text in options dialog.

Add small doc about the svnrobots.txt file.

Implement using an svnrobots.txt file which can set certain rules to reduce 'hammering' a server:
* disallowautodiff : if set, then automatic diffs are not allowed
* checkinterval = XX : minimum interval in minutes between checks

Add static method to get a path string to a temporary file.