new branch, lots of work to do to obtain the chemical process/kinetics model hierarchy
updates on files (#2848)
Chemical processes added, not yet finished (#2848)
(#2848) updates
Unit test for rates added and running
Checkpointing - roystgnr
start the sensitivity outputs, raised kinetics_unit tests threshold
(#2848)
updates

Description of prod/loss/net rates done (#2848)
Aesthetics: rate object have two layers of parameters:
  - input parameter and scalers
  - reduced parameters for fastest calculations
(#2848)
doxygen common folder local copy removing
first step to merging, main resolutions #2848
almost done, some weird results in kinetics_evaluator::compute_mass_sources_and_derivs, on it #2848
some tests and verifs yet to be done
all tests passed
last merge with trunk, all ok #2848
Merge branch 'master' into ReactionFactory
Merge branch 'master' into ReactionFactory
Revert "doxygen common folder local copy removing"

This reverts commit eeda653fd17755b553c16c00af4474188588c4da.
Merge branch 'master' into ReactionFactory
Cleaning up Doxygen build.