commitmonitor Code

- Abstracted SVN calls to a 'SCCS' API
- Implemented basic version of this API for Accurev (v4.7.1)
- Modified OptionsDlg to specify Accurev parameters
- Modified URLDlg to add option to select which SCCS to use, and enter Accurev parameters

Big TODOs
- Replace ugly parsing with XML parser
- Clean up implementation of diff for Accurev
- Move starting of diff to background loop
- Make use of already existing diff parameters
- Implement missing features, or disable them at least in Accurev mode
- Update CommitMonitor_VS10.sln (I do not have access to VS2010)