subversion/bindings/swig/include
(svn_checksum_t.swg) : Generated a typemap.
(svn_checksum_kind_t,svn_checksum_create,svn_checksum_clear): typemapped these functions

Suggested by: Stefan Sperling <stsp@elego.de>
              Ben Reser <breser@fornix.brain.org>
              Daniel Shahaf <~danielsh@apache>