Update to ctsm5.1.dev084

Update to ctsm5.1.dev074

Update to ctsm5.1.dev073

Update to ctsm5.1.dev065

Update to ctsm5.1.dev064

Update to ctsm5.1.dev054

Some changes to matrix because soil decomp CN option removed.

Add scale_by_thickness required argument for restartvars 2D matrix da…

…ta, also add dt local variable, this is needed to compile on cheyenne

Fix problem with default LND_TUNING_MODE for cases coupled to CAM. Up…

…date some of the README

files. And also bring in a PTCLM version that will work in the new CTSM git checkout directory
structure.

Documentation tag same as clm5.0.000 (with a few documentation files …

…updated) with our new naming convention.

Initial version of CLM5.0 science series version 000.