Disable value snapping (implementation in progress)

[Algiane]

Enable value snapping in distributed ls discretization mode only when PMMG_SNAPVALenvironment variable is defined (implementation of the distributed value snapping is in progress).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 63.72%. Comparing base (6c00cae) to head (3e0ec64).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/ls_pmmg.c	50.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #133   +/-   ##
========================================
  Coverage    63.72%   63.72%           
========================================
  Files           47       47           
  Lines        19419    19421    +2     
  Branches      3632     3632           
========================================
+ Hits         12375    12377    +2     
  Misses        6098     6098           
  Partials       946      946           

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