Move frequency paramaters to VJ

-Move frequency parameters from stop_time to vehicle_journey, save at least 3* uint32_t per vehicle_journey
-Enforce arrival/departure time in stop_time to be relative from 0
-Calculate low/upper threshold using relative times and VJ frequency paramaters
Reshuffle VJ struct, save 8 bytes from padding
Reshuffle constructor, resolve order warnings
Kraken: Add start/end_time function
Kraken: use of start/end_time
Ed: Move parsing of start/end_time and headways out of the loop
Kraken: distinguish arrival/departure_time in start/end_time
Merge remote-tracking branch 'vincent/vj_freq_parse' into vj_freq
Ed: fix a typo
Merge pull request #4 from l-vincent-l/remove_headway_secs_vj

Ed: fix a typo
Merge remote-tracking branch 'canaltp/dev' into vj_freq

Conflicts:
	source/ed/ed_reader.cpp
Fix merge error
Merge pull request #444 from bliksemlabs/vj_freq

Move frequency paramaters to VJ