Fix boundary issues and numerical precision trouble in RUC LSM (NCAR#587

)

* fixes and workarounds for uninitialized memory in fv_regional_bc

* initialize kmaxfire in module_bl_mynn

* smoke bug fixes for restart

* remove smoke bug fixes

* remove workarounds and fix remaining known bugs in ps_reg

* a few more surface pressure bug fixes; now the test case runs in debug mode

* ccpp/physics: module_sf_ruclsm imprecision workaround for gfortran -DDEBUG=ON

* move sanity checks to lsm_ruc and add "snow on ice" check

* use i-1 & j-1 for two-point averages, when available

* Replace many changes with atmos_cubed_sphere PR NCAR#220