Pde global logging

[TTitscher]

Add three global logger objects, accessible via

#include <nuto/base/Logger.h>

NuTo::Log::Info << "info stuff\n";
NuTo::Log::Debug << "debug stuff\n";
NuTo::Log::Error << "error stuff\n";

To identify the output coming from these loggers, a prefix is added. The above code will produce

Info|  info stuff
Debug| debug stuff
Error| error stuff

either on cout (controlled by ::SetQuiet(bool)) or in a file (controlled by ::OpenFile(string)). By default, debug is quiet.

[codecov[bot]]

Codecov Report

Merging #240 into PDE_reviewed will increase coverage by 0.2%. The diff coverage is 98.41%.

@@               Coverage Diff               @@
##           PDE_reviewed     #240     +/-   ##
===============================================
+ Coverage         89.86%   90.07%   +0.2%     
===============================================
  Files               329      330      +1     
  Lines             10871    10888     +17     
===============================================
+ Hits               9769     9807     +38     
+ Misses             1102     1081     -21

Flag	Coverage Δ
#integrationtests	63.98% <86.95%> (+0.18%)	:arrow_up:
#unittests	95.48% <92.45%> (-0.1%)	:arrow_down:

Impacted Files	Coverage Δ
nuto/mechanics/tools/AdaptiveSolve.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/tools/QuasistaticSolver.h	100% <ø> (ø)	:arrow_up:
nuto/mechanics/tools/QuasistaticSolver.cpp	91.22% <100%> (+1.06%)	:arrow_up:
nuto/math/EigenSparseSolve.cpp	91.17% <100%> (+0.26%)	:arrow_up:
nuto/mechanics/tools/AdaptiveSolve.cpp	96.55% <100%> (+4.24%)	:arrow_up:
test/base/Logger.cpp	100% <100%> (ø)
nuto/base/Logger.h	100% <100%> (+18.18%)	:arrow_up:
nuto/base/Logger.cpp	96.77% <96.55%> (+66.77%)	:arrow_up:
nuto/base/Timer.cpp	88.46% <0%> (+11.53%)	:arrow_up:

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[TTitscher]

I find it quite handy to collect the log files in one place, e.g. the post processing directory. In my simulations, these directories are created at run time and I cannot redirect the output to this not-yet-existing directory.