Update gama to 1.15.  Upstream NEWS:

Version 1.15 February 2014

* DTD replaced with XSD for gama-local.xsd and
  gama-local-adjustment.xsd. Attribute version describing XML version
  of input and adjustment outpup XML documents became useles with
  introduction of XSD a was removed from tags <gama-local> and
  <gama-local-adjustment>. Some more elements attributes were
  introduced in revised XML formats which are incompatible with older
  versions.
Updated geography/gama to 1.15