save keybindings to file used at startup; allow keybindings file to be cmdline-specif...

save keybindings to file used at startup; allow keybindings file to be cmdline-specified; remove some GTK2FIX comments; fix feedback based on john anderson's patch; apply scons patches; fix crash when taking MIDI ports online+offline; try to prevent aborts when shutting down due to metering thread; start work on reconstructing GlobalFOOCommand commands; use ftruncate to hint at peakfile preallocation to reduce fragmentation

git-svn-id: svn://localhost/ardour2/trunk@1223 d708f5d6-7413-0410-9779-e7cbd77b26cf