mysql-test/r/partition.result:
  Added new test cases
mysql-test/r/partition_error.result:
  Fixed test case
mysql-test/t/partition.test:
  Added new test cases
mysql-test/t/partition_error.test:
  Fixed test case
sql/ha_partition.cc:
  Review fixes
sql/partition_element.h:
  Review fixes
sql/partition_info.cc:
  Review fixes
sql/share/errmsg.txt:
  Review fixes
sql/sql_partition.cc:
  Review fixes
sql/sql_yacc.yy:
  Enabled possibility to use (MAXVALUE) as well as MAXVALUE.