fix: fill last group data between groups

fix: get systable cols error

docs: taos api description

* docs: fix taos_init() return type

* docs: refine c interface doc

"...releases/tag/latest" should be "...releases/latest", which will automatically redirect to "...releases/tag/<latest-version>"

fix(stream): fix memory leak and do some internal refactor.

fix: document issues

fix:set terrno = 0 to avoid affect next fetch msg

fix: important fix for compact file corruption

* fix: use latest version of jdbc connector

* fix: remove locale and timezone to avoid confusing user

* fix: update readme.md

* fix: refine demo.c

fix: modify column length for super table

fix: tsdb snapshot bug

refactor: do some internal refactcor

fix: memory leak when commit

docs:modify format & add logic for dot in schemaless

fix(stream): continue process when met with trans-state msg.