- added wrapper for BasicTimeZone.getTimeZoneRules, getSimpleRulesNear
   - added wrapper for BasicTimeZone.hasEquivalentTransitions
   - added wrappers for DateTimeRule, DateRuleType, TimeRuleType

added wrapper for TimeZoneRule.isEquivalentTo
added wrapper for TimeZoneTransition.getTime, getFrom, getTo
added wrapper for BasicTimeZone.getNextTransition, getPreviousTransition

  - added wrapper for BasicTimeZone.getOffsetFromLocal
  - added wrappers for VTimeZone creation methods
  - added wrappers for VTimeZone.write, writeSimple, getTZURL, getLastModified

Update explanations about strings to reflect Python 3.

See merge request !141

  to MeasureUnit *