minor changes to make icar compile with cray and run

[bertjebertjek]

TYPE: bug fix

KEYWORDS: Cray, NoahMP, precision, compiler

SOURCE: Bert Kruyt, NCAR, RAL

DESCRIPTION OF CHANGES: makefile: water_simple now depends on options_h. Apparently gnu was ok without it, but cray is not. NoahMP: an error check in NoahMP that compares SWDOWN (downward solar filtered by sun angle [w/m2]) to the sum of FSA ( total absorbed solar radiation (w/m2)) and FSR (total reflected solar radiation (w/m2)) gives an error if the difference is more than 0.01 W/m2. When compiled with cray, this condition is too stringent and the error is triggered. I increased the threshold to 0.1 W/m2.

TESTS CONDUCTED: runs - havent checked results but unlikely that <0.1 W/m2 makes a difference. Compiles with gfortran as well as cray (on Perlmutter)

Checklist

Merging the PR depends on following checklist being completed. Add X between each of the square brackets if they are completed in the PR itself. If a bullet is not relevant to you, please comment on why below the bullet.

• [ ] Closes issue #xxxx (An issue must exist or be created to be closed. The issue describes and documents the problem and general solution, the PR describes the technical details of the solution.)
• [ ] Tests added (unit tests and/or regression/integration tests)
• [x] Backwards compatible
• [ ] Requires new files? If so, how to generate them.
• [ ] Fully documented

[gutmann]

holding off on this for now since it seems like something else is going wrong still?