1) Fixes breakage in embedded server build for XMLPath push.
2) Hides PARTITION engine from view.
3) Add ENGINES information schema (and it should now be clear from this patch on how to turn any show command into an information schema).


libmysqld/Makefile.am:
  Fix for embedded server to build.
mysql-test/r/information_schema.result:
  Fix for additional information_schema
mysql-test/r/information_schema_db.result:
  Fix for adding additional engines information schema.
mysql-test/t/information_schema.test:
  Added test to make sure that engines information schema works.
sql/ha_partition.cc:
  Made PARTITION hidden in information schema.
sql/sql_parse.cc:
  Added additional case for engine information schema.
sql/sql_show.cc:
  Code for ENGINES information schema.
sql/sql_yacc.yy:
  Extended grammer to support new ENGINES information schema
sql/table.h:
  Comment on dependency in information schema.
libmysqld/item_xmlfunc.cc:
  New BitKeeper file ``libmysqld/item_xmlfunc.cc''