commitmonitor Code

add version file.

Implemented issue #72: Add fourth column showing start of commit message

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

Update to neon 0.28.3 and Subversion 1.5.2

Use the new utility function to find out the installation path of TortoiseSVN.
This solves issue #80.

Add function which returns the installation path of TortoiseSVN.
The 32-bit version is preferred, but if it is not installed, the x64 version of TSVN is used instead if that one is installed.

This is the first step to resolve issue #80.

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.

Add keyboard shortcuts:
N : go to the next unread item. If there are no more unread items in the currently selected project, move to the next project which has unread items.
B : goes back one message

Implements part of issue #73: Keyboard shortcuts

Subversion doesn't need SQLite anymore for some time now...

USE_32BIT_TIME_T is not necessary.