Import plot icon updated.
Menus string names updated to avoid conflicts.
Added extension for auto-loading all layers.

The extensions automatically connects to the
sqlite file pmf.sqlite, which should be inside
the cfg gvSIG folder, and loads the ELLE map
PMF. It also hides all DBConnection and ELLE
extensions' buttons.
Fixed some mistakes in centros educativos form.
Extensions refactored to the same base package.

This is more coherent with our usual project structure.