Many platforms override ACCNR with a hard-coded value

[SamuelTrahanNOAA]

The giant "if/elif/fi" block in rt.sh overrides the ACCNR to a hard-coded value, overriding the value the user sets before running rt.sh. This is in part necessary due to detect_machine.sh setting the default to nems, which is usually wrong. An earlier bug fix did not completely correct the problem. (See also #979, #1014, and #981.)

The detect_machine.sh is run before the rt.sh per-platform default logic, setting the nems variable:

# Default account "nems"
export ACCNR=${ACCNR:-nems}

Hence to use the account most users require, the rt.sh has to override the detect_machine.sh and user's setting with a hard-coded value like so:

ACCNR=GFS-DEV

The fix is for detect_machine.sh to NOT set ACCNR. Instead, rt.sh's per-platform block will set the defaults in a way that does not override the user's defaults:

ACCNR="${ACCNR:-h-nems}"

After the giant "if" block there will be a default setting to ensure the original behavior (ACCNR=nems) if neither the user nor per-platform block sets the value:

# If account is unspecified, assume the machine has a "nems"
# accounting code.
export ACCNR="${ACCNR:-nems}"

[SamuelTrahanNOAA]

Corrected by #1009