Add grdcontour to the list of callable nested modules.

[joa-quim]

Add two options to grdimage.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.87%. Comparing base (53d9f2b) to head (917b233).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/finish_PS_nested.jl	25.00%	3 Missing ⚠️
src/common_options.jl	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1659      +/-   ##
==========================================
+ Coverage   85.86%   85.87%   +0.01%     
==========================================
  Files         153      153              
  Lines       21431    21441      +10     
==========================================
+ Hits        18401    18413      +12     
+ Misses       3030     3028       -2     

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