Move from AM_GNU_GETTEXT to AM_GLIB_GNU_GETTEXT

This eliminates a rare error when Gettext says that Makefile.in.in is
not generated by intltoolize while it is.
Reorder Edit GtkGrid’s children to be a bit more logical
Add chart note support

It is saved under /chartinfo/note, and may be non-existant or an empty
tag.

Fixes #28
Merge pull request #30 from gergelypolonkai/chart-note

Add chart note support
Merge branch 'master' into webkit2
Add class private to AgApp
Copy the default chart CSS to the resource database
Load default chart CSS to AgApp’s private member, web_view_group

This will make sure at least one CSS is loaded for each web view created
later.
Remove WebKitWebView creation from Glade

The Glade template cannot assign an already created WebKitWebViewGroup
to the WebKitWebView it creates. Thus we need to create it manuallp