First profiling test

[najaverzat]

• add file test/perf/generalized_assignment.jl : allows to use PProf.jl to generate a profile for several small instances of tests
• add file test/perf/glossary.md : wip, should gathers some tips and useful links to interpret profiles generated with PProf

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (00f3bda) 69.10% compared to head (9b694c8) 69.10%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #910   +/-   ##
=======================================
  Coverage   69.10%   69.10%           
=======================================
  Files          82       82           
  Lines        5882     5882           
=======================================
  Hits         4065     4065           
  Misses       1817     1817           

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