Put PRIMARY KEY and UNIQUE keys before other keys
Fixes for auto_increment keys for BDB tables


Docs/manual.texi:
  Changelog
sql/ha_berkeley.cc:
  Fixes for auto_increment keys
sql/sql_table.cc:
  Put PRIMARY KEY and UNIQUE keys before other keys
sql/sql_update.cc:
  Bugfix when using a multi-part unique key in the SET and WHERE part