Docs/manual.texi:
  Updated changelog.
  Update info about MERGE tables.
  Moved section 'Why so many open tables'
mysql-test/r/create.result:
  Added test of types in CREATE
mysql-test/t/create.test:
  Added test of types in CREATE
sql/item_func.cc:
  More different values for RAND(nr) and RAND(nr+1)