FIX BUGS: [TD-2548]:wrong error message is showed when taos connect failed [TD-2477]:taosd crash when executing queries [TD-2538]: crash when sql has limit & offset [TD-2534]: fix crash on null pointer parser [TD-2528]: messy characters in alert msgs [TD-2487]: create stble with a wrong type tag but report length too long [TD-2464]: validate maxTablesPerVnode and reset to minTablesPerV… [TD-2484]: use IPv4's AI_INET instead of AI_UNSPEC [TD-2550]: fix nodejs bug in new version. [TD-2482]: fix bug in the skiplist iteration during query processing. [TD-2471]: fix the bug during the removal of elements in trashcan. [TD-2488]: fix super table bug. ENHANCEMENTS: [TD-2434]: reduce the memory requirement during super table interval query. NEW FEATURES: DOCS: [TECO-39]: continue refine connector page. TEST: [TD-2488]: add test case [TD-965]: add test case for TWA