Pde fix another bug in constraint matrix

[pmueller2]

Fixes a bug when building the constraint matrix.

A prerequisite when doing this constraints stuff is a numbering that is a permutation of 0,...,numDofs or in other words: it is a dense/continuous numbering starting with 0. The constraint matrix is rectangular with as much rows as dofs and as much columns as there are independent dofs. When referring to the rows of the constraint matrix one uses the original numbering but for the columns the numbering of the independent dofs is needed (with the dependent ones removed but continuous, starting at 0). There is now a method that returns this ordered numbering that is used by the BuildConstraintMatrix routine.

The actual bugfix is indicated with a comment.

[codecov[bot]]

Codecov Report

Merging #245 into PDE_reviewed will increase coverage by 0.03%. The diff coverage is 95.12%.

@@               Coverage Diff                @@
##           PDE_reviewed     #245      +/-   ##
================================================
+ Coverage         84.54%   84.57%   +0.03%     
================================================
  Files               299      299              
  Lines             11000    11018      +18     
================================================
+ Hits               9300     9319      +19     
+ Misses             1700     1699       -1

Flag	Coverage Δ
#integrationtests	62.12% <91.66%> (+0.1%)	:arrow_up:
#unittests	87.85% <95.12%> (+0.04%)	:arrow_up:

Impacted Files	Coverage Δ
nuto/mechanics/constraints/Constraints.h	100% <100%> (ø)	:arrow_up:
test/mechanics/constraints/Constraints.cpp	98.7% <100%> (ø)	:arrow_up:
nuto/mechanics/constraints/Constraints.cpp	95.09% <93.54%> (+1.83%)	:arrow_up:

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