Add gettabletype to identify the sql table type
Add a shapefile to test external table type.
Add a dependency to H2Driver to read file_table
Improve the message when the user tries to delete a table in the geocatalog. External, System and normal tables are now identified.
Do not remove reserved system tables
Fix I18n plurals
Merge remote-tracking branch 'irstv/master' into merge/724

Conflicts:
	orbisgis-view/src/main/java/org/orbisgis/view/geocatalog/Catalog.java
Merge pull request #732 from nicolas-f/merge/724

This PR improves the user experience with the remove table panel.
Right now, the type of tables are identified : external, table, system.
If a SYSTEM TABLE is select the user cannot remove any tables.