[Amibe] Enhance the analytic metric based on the point metric file

Add singularity order 'alpha' for analytic metric
Add pseudo-numerical metric with criterion 'rho'
Add mixed analytic with numerical criterion metric
Update options in refine.py to chose between metrics
[Amibe] Update example of RemeshMetric in python script for the cube model problem

Modify analytic metric for a singularity in 1/r^alpha
Document python script about singularity order
[Amibe] Add numerical criterion and mixed metric in class RemeshMetric
[Amibe] Cosmetics: update help on remesh.py
[Amibe] add initial procedure for remeshing around singularities
[Amibe] Simplify computation of numerical metric with linear interpolation
[Amibe] Analytic metric: add comments
[Amibe] remeshSingularity: add coplanarity option in terms of angle
[Amibe] remeshSingularity: cosmetics
[Amibe] remeshSingularity: add comments
[Amibe] remeshSingularity: replace useless and complicated example of Remesh class
[Amibe] update remeshSingularity procedure

Methodology to remesh around a slot and local values
[Amibe] Numeric metric: geometric interpolation on first interval
[Amibe] remeshSingularity: fix boolean arguments
[Amibe] remeshSingularity: remove project option (not yet implemented)