Merge pull request #22 from snickers2029/develop

sqlfinder now works with IsOrigin
added: stop searching if get N empty queries in a row. also add a check for MaxConnectMins < MinConnectMins
Merge pull request #23 from HaoranHuang/develop

added: stop searching if get N empty queries in a row. also add a check ...
added sorting
Merge branch 'develop' of https://github.com/FlightFinder/OAG_Schedule into develop