add mean intensity map

[StRigaud]

add mean intensity map

[codecov-commenter]

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Codecov Report

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

Project coverage is 47.67%. Comparing base (4e8662d) to head (1ae9731).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
clic/src/tier4/parametrics_map.cpp	37.50%	0 Missing and 5 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
- Coverage   47.70%   47.67%   -0.03%     
==========================================
  Files         243      243              
  Lines        4000     4008       +8     
  Branches     1830     1835       +5     
==========================================
+ Hits         1908     1911       +3     
  Misses        660      660              
- Partials     1432     1437       +5     

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