improve the account remove and add support for slurm

[jedwards4b]

Improve the account remove function and add support for slurm.

Test suite:
Test baseline:
Test namelist changes:
Test status: bit for bit

Fixes #4465

User interface changes?:

Update gh-pages html (Y/N)?:

[jgfouca]

Thanks for the quick PR! I think the logic in the first if statement may be off
if (A or B and C)
The and has the higher precedence, so B and C is evaluated first.

I think you want
if (A or B) and C

[jedwards4b]

fixed