added engine type to vspeed lookups
added vspeed table for B757-200 series with RB211_535C_37 engines
Fixed v2 test
fix for Eng_N1MinFor5Sec to remove troughs as is looking for minima
changed hashing of airspeed array during split segments to hash only sections of airspeed above the AIRSPEED_THRESHOLD for more than 32 samples to handle cases where one of a pair of duplicate segments can have several samples of data from another flight at the start of its data therefore creating a different hash.
Merge branch 'master' of https://github.com/FlightDataServices/FlightDataAnalyzer