commitmonitor Code

Mask out the four lowest bits in the wParam of the WM_SYSCOMMAND message as stated in the docs.
This adds to issue #44.

Patch from lanwin.de (slightly modified by me):
Fix issue #44.

* Save the dialog position right before the dialog gets maximized.
* Do not save the dialog position on close if it is maximized.
This implements issue #44.

Restore the slider positions correctly with half the slider width as an offset.

Make using TortoiseSVN for showing the diffs optional.

Add a ".diff" extension to the unified diff files.
This implements issue #40.

* Refactor the child window positioning code out from OnLButtonUp() into PositionChildWindows()
* Store/Restore the slider positions on dialog show/hide.

This implements issue #32.

Before using the project name in a path, convert all special chars.
This fixes issue #35.

If no author or date is available, show "(no author)" or "(no date)" instead of an empty string or a bogus date.

Speed up the loop by moving ListView_GetItemCount() outside the loop.