Updated autogen.sh to automatically update submodules
Removed non-needed window_main from UI file
Removed all unneeded elements from astrognome.ui
Removed all old code from astrognome.c
Changed variable name to create some consistency
Created chart editing tab, making it the default
Added empty GsweTimestamp and GsweMoment objects to AgWindow
Changing away from the edit tab will recalculate chart data
Added icons