Enhanced cookie handling for API
Experimental: Only report car_time in STAT response if 1980...
Merge branch 'master' of https://github.com/openvehicles/Open-Vehicle-Monitoring-System.git
- SMS "GPRS?" tells about GPRS switch status
- SMS "HOMELINK", "LOCK", "UNLOCK", "VALET" & "UNVALET" may now be
  called without parameters
Added client script for status queries