Merge pull request #24 from se5a/master

Orders filtering improvement
Missile Defense testing and refinement

MD should work now. there may be an issue with MFCs firing off one too
many volleys but I believe that has been fixed.
potential fix for Windows 64 bit issue

if this doesn't work there is a more serious issue at work.
Merge branch 'master' of github.com:Pulsar4xDevs/Pulsar4x