Updated DBAL.
Added InformixPlatformTest::getQuotedAlterTableChangeColumnLengthSQL() method.
Skipped not supported test InformixPlatformTest::testQuotesAlterTableRenameIndexInSchema().
Skipped test InformixPlatformTest::testGetCommentOnColumnSQLWithoutQuoteCharacter().
Skipped test InformixPlatformTest::testGetCommentOnColumnSQLWithQuoteCharacter().
Added tests related to partial indexes.