commitmonitor Code

* handle WM_QUERYENDSESSION in the main dialog window
* always return TRUE for WM_QUERYENDSESSION

Increase the wait time to four seconds (system shutdown allows an app to use up 5 seconds before it's forcefully closed).

Check for the library before freeing it.

Use `empty()` instead of `size()` where possible.

Initialize variables and fix a resource leak.

Found by Coverity.

Redirect the version check file to version6.txt to avoid having older clients pop up update notifications. Those running on XP would get annoyed since they can not update.

Use the proper size and type specifier in printf calls.

Store the last-checked revision in a separate variable when fetching the next few log messages so it can be used as the start revision. Also set the last-checked revision to zero so the 'limit' is used.
(Fixes issue #441) : Fetch next 100 inaccurate/does not work

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use the _countof macro instead of explicitly specifying the number of elements