* pandoradb.sql, extras/pandoradb_migrate_v3.0_to_v3.1.sql: Modified data
model using a new table tgis_data_status to save the current GIS data and
the table tgis_data_history to store the historical GIS data. That also
means that the GIS related fields from the table tagente are now in the
table tgis_data_status. The foreign key in the table tgis_map_layer to
tgrupo has been droped because now it's possible to have layers without
group, just agents.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@2374 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
fc6c4c678a