Fix warnings detected on cdash ci

[fspindle]

• Fix warnings like conversion de 'size_t' en 'unsigned int', perte possible de données
• Fix various typos

[codecov]

Codecov Report

Attention: Patch coverage is 78.37838% with 8 lines in your changes missing coverage. Please review.

Project coverage is 45.22%. Comparing base (2d8f856) to head (40e6bf9).
Report is 4 commits behind head on master.

Files	Patch %	Lines
modules/core/src/math/matrix/vpColVector.cpp	50.00%	4 Missing ⚠️
modules/core/src/math/matrix/vpRowVector.cpp	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1431      +/-   ##
==========================================
- Coverage   45.22%   45.22%   -0.01%     
==========================================
  Files        1106     1106              
  Lines      109993   109997       +4     
  Branches    18868    18867       -1     
==========================================
+ Hits        49748    49749       +1     
- Misses      60245    60248       +3     

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