Change return value from boolean to enum mapistore_error to have
larger choice than true/false in sanity checks.
debugging message over mapistore_init should not rely on retval
Add missing SQL schema file for openchangedb mysql backend
install sql schema files for mapistore mysql backend
Remove non needed memory allocation on LDB database string
Move backend prefix definition to heir own header
Add BEGIN_DECLS/END_DECLS defines