Removed GTK-Doc style documentation

It makes no sense. Some functions may remain having a documentation block, though.
Started implementing load/save functionality
Created ag_chart_new_full() instead of ag_chart_new()
Changed AgWindow's moment to an AgChart for later saving functionality.
Changed package name to Astrognome for prettier --version output
Renamed ret to chart in ag_chart_new()
NLS related fixes in main()
Added option --new-window to remotely open a new window.
Now adding all planets to the chart

The chart generating procedure will decide what to show and what not.
Since GNOME itself has a requirement for a slightly fast machine, it
is not very likely that it will cause speed issues.
Changed variable name self to app in AgApp methods
Moved command line options into main()

Global variables for this just didn't seem right.
Removed non-used struct print_data
Changed application_activate_cb() signature

Made it so casting is no longer needed inside.
Added a comment in run_action()
Created function ag_app_create_window() for file opening purposes
Added the skeleton of command-line opening

* It does nothing at the moment
* --help output already reflects the file opening possibility
Merge branch 'loadsave' of github.com:gergelypolonkai/astrognome into loadsave

Conflicts:
	src/ag-chart.c