Update SAR to the newest format (#389)

* Tests passing

* Add new test

* Update SAR to the newest format

* Rm stray debug statement

* sarTests: Minor adjustment

* Let a test print its output on failure, as cannot figure out the problem

* Fix a test, not sure about the reason for the divergence

* Use gmttime as suggested by the Z timestamp, and not local time

* Try setting the daylight savings time bit

* Use daylight savings time

* Try avoiding local time altogether

* Modularize code

* Include ctime for Windows to build

* Must be std::ctime

Co-authored-by: Jesse Mapel <jmapel@usgs.gov>