Add new Ada port: devel/gnatcoll
These components are a major building block of the GNAT Programming
Studio. As the package description below states, it can also be used
generically. This splits GNATColl out prior to GPS version upgrade.
The reusable library known as the GNAT Component Collection (GNATColl)
is based on one main principle: general-purpose packages that are part of
the GNAT technology should also be available to user application code.
The compiler front end, the GNAT Programming Studio (GPS) Interactive
Development Environment, and the GNAT Tracker web-based interface all
served as sources for the components.
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