irstv/H2GIS — pull request #415 by nicolas-f (2014-10-17 14:49:01+00:00)
Title: Spatial index on linked files

Add spatial index feature on linked files. This index is persistent and saved into the database meta-data as regular index.

The query is the same as regular table:
```mysql
CREATE SPATIAL INDEX ON TABLENAME(FIELDNAME);
```