fixed parse_ns & fmt_ns with ns at neg and ms/us float point in SWC::Time
added include/core/ErrorCode.h with only enum SWC::Error::Code
added enum client::SQL:Cmd & Cmd recognize_cmd(int& err, const string& sql)
added SWC::Thrift::Result and function Results exec_sql(1:string sql)
added timestamp interval(one-side) to support Condition::NE in client::SQL
moved Python pkg module swcdb.thirft.gen to swcdb.thirft.native
added Python package with modules swcdb.thrift.{tornado,twisted,zopeif}
added PyPi package 'swcdb', `pip install swcdb` available
moved src/py/swcdb/pkg to src/py/package/swcdb
extended doxygen with Doxyfile for each Doxyfile-[language].doxy
added documentations to docs/ and configured Jekyll build
changed from gh-wiki to documenaions on www.swcdb.org website & GitHub Pages
fixed quit call in Ranger CompactRange::response on error