* fixed crash on sea battles (obstacles data got corrupted during conversion)
* fixed crash when StupidAI had a catapult
* minor fixes and refactorings (typename for bonus list under shared ptr)
-- Reduced memory usage for images with margins
-- Implemented RLE compression
- Linux-related changes:
-- build system updated to include changed paths
-- new dependency: boost-program-options
-- configure option --disable-debug will produce optimized build
- Several gcc compile fixes
- Optimized CPU usage on town screens
- Removed several includes from headers
- Possible fix for #496