added a python charting file (in charting folder with default/AI/) to help visualize AI performance.  comments in the file explain nonstandard modules required 

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5711 dbd5520b-6a0a-0410-a553-f54834df5b05
Early aborts for meter updating functions when there are no target objects.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5712 dbd5520b-6a0a-0410-a553-f54834df5b05
Made first scanner upgrade tech cheaper.

git-svn-id: https://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk@5713 dbd5520b-6a0a-0410-a553-f54834df5b05
Merge remote-tracking branch 'svn-mirror/master'