Refs NOAA-EMC#397

- SC2250 – Prefer putting braces around variable references even when not strictly required.
- Add curly braces around variables where missing in env files.

Refs NOAA-EMC#397

- SC2086 – Double quote to prevent globbing and word splitting.
- Add double quotes around variables where missing in env files.

Refs NOAA-EMC#397

- SC2292 (style): Prefer [[ ]] over [ ] for tests in Bash/Ksh.
- Change [ ] to [[ ]] where needed in env files.

Refs NOAA-EMC#397

- SC2166 (warning): Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.
- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.
- Change "-o" to "||" and "-a" to "&&".
- Also apply more SC2292 double brace updates to lines that had SC2166 updates.

Refs NOAA-EMC#397

- SC2004 (style): $/${} is unnecessary on arithmetic variables.
- Update arithmetic expressions accordingly in env files.

Refs NOAA-EMC#397

- SC2034 (warning): NTASKS appears unused. Verify use (or export if used externally).
- Add "export" for NTASKS variable setting in waveprep if-block.

Refs NOAA-EMC#397