add switch --silent & close #1763

[GillesDuvert]

"--silent" prevents "Compiled Module XXX" messages to appear (see #1763) . But can eventually be helpful to prevent other kind of messages in the future.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 42.71%. Comparing base (20545ef) to head (a018416).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/gdl.cpp	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1769      +/-   ##
==========================================
- Coverage   42.72%   42.71%   -0.01%     
==========================================
  Files         361      361              
  Lines       97320    97328       +8     
  Branches    19918    19923       +5     
==========================================
+ Hits        41576    41577       +1     
- Misses      55744    55751       +7     

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