Upgraded to gnatcoll-core 2018.
    
    This is now the gnatcoll-core source package. gnatcoll-bindings and gnatcoll-db
    are separate source packages.
    
    The subpackages gnatcoll and gnatcoll-devel are metapackages that pull in all
    the Gnatcoll packages to ensure a clean upgrade path. The documentation has
    been split off into a separate subpackage.