Taged a couple of tests with --big-test

configure.in:
  Upgrade version number
mysql-test/suite/parts/t/partition_alter1_1_2_innodb.test:
  Removed duplicate big_test tag
mysql-test/suite/parts/t/partition_alter1_2_innodb.test:
  Removed duplicate big_test tag
mysql-test/suite/parts/t/partition_decimal_innodb.test:
  Added big_test tag as this takes forever with valgrind
mysql-test/suite/parts/t/partition_decimal_myisam.test:
  Removed duplicate big_test tag