Extend the grid algebraic operations to GMTimage as well.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 41.02564% with 23 lines in your changes are missing coverage. Please review.

Project coverage is 90.25%. Comparing base (149a3a3) to head (da8e19f). Report is 26 commits behind head on master.

Files	Patch %	Lines
src/grd_operations.jl	32.35%	23 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1419 +/- ## ========================================== - Coverage 90.38% 90.25% -0.13% ========================================== Files 134 134 Lines 17329 17364 +35 ========================================== + Hits 15662 15672 +10 - Misses 1667 1692 +25 ```

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