Fixed data in example file
Now setting chart name based on edit form
Started creating save functionality
Created ag-chart-error-quark and AgChartError enum
Moved chart loading into ag_chart_load_from_file(), where it was intended to be
Changed ag_chart_save_to_file() prototype to a more sane one
Created a Save As... menu item
Added uri to AgWindow's private structure, for saving purposes
ag_app_open_chart() now saves the URI of the opened chart to the created window
Added an example chart that was already generated by Astrognome.
Fixed ag_chart_load_from_file() to return on xpath matching errors
Moved XML creation code to AgChart's create_save_doc()
Implemented ag_chart_save_to_file
Merge branch 'loadsave'

Conflicts:
	data/examples/saved-chart.agc