Multisensor (#3792)

* added SCCONFIG parameter to jigsaw

* fixed problem with how I was assigning observation numbers, added history comments

* fixed problem with how I was removing observation numbers

* cleaned up BOSS constructor

* more fixes to BOSS constructor

* added BOSS gtest

* Added jigsaw scconfig app test

* Added scconfig with heldlist app test

* more updates to xml save test

* finished xml save test

* Updated with Themis VO data

* Updating jigsaw errors

Co-authored-by: Peter Aaron Giroux <pgiroux@contractor.usgs.gov>