Building with PGI

[qingli411]

We are trying to use GOTM turbulence library in MPAS-Ocean (See this PR MPAS-Dev/MPAS-Model#704). But the use of spacing in the following line causes an error when building with PGI -- spacing doesn't seem to be supported in initialization in PGI (see more details in the discussion near the end of the above PR of MPAS-Ocean).

flexout/src/field_manager.F90

Line 44 in 66535b1

real(rk),parameter :: default_minimum = default_fill_value + spacing(default_fill_value)

As suggested by @mark-petersen, changing this line to

real(rk),parameter :: default_minimum = default_fill_value * 0.9999999_rk

seems to fix this. So I'd like to check with you if it makes sense to make this change in flexout? @bolding @jornbr