commitmonitor Code

Closes issue #91
* add error number parameter to CUrlInfo class
* when an error happens, save the error number
* before checking a repository, check the last error number and prevent the check if the error was SVN_ERR_RA_NOT_AUTHORIZED until the user cleared the error

Fixes issue #123
* add boolean state to the CUrlInfo class
* add context menu for the tree control to enable/disable monitoring
* show a gray icon if the project is not currently active (i.e., monitored)
* skip checking the project if it's not monitored

Fixes issue #147:
Check for the process name to be CommitMonitorLocal.exe, and if it is (instead of the default CommitMonitor.exe), save/load all data in the same directory as the application exe file is instead of %APPDATA%\CommitMonitor.

Implemented issue #106: "Ignore users" isn't considered when executing "Script/Command"

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

Implemented issue #7: Custom action after commit detection

* add edit box for the command line string to execute to the url dialog
* replace the strings in the command line:
%revision - replaced with the new HEAD revision number
%url - replaced with the url of the project
%project - replaced with the project name
* execute the command line string when new commits are detected

Implemented issue #92: Enhancement: Ignore list of users

Remove the option to automatically fetch the diff.

Create a backup of the urls file after a successful load.

This adds to issue #62: After PC system crash, CommitMonitor loses all repository settings and commit history

Fix bug: when the limit of 1000 log entries saved is reached, loading the file again didn't work properly and subsequent projects were not loaded anymore. This lead to 'lost projects' as reported in issue #62 and issue #70.