Document meshing algorithm

[thomaslepoix]

The meshing process consists of two parts:

• The geometrical analysis that, given a structure, outputs some MeshlinePolicies ("Here is something of interest that must be meshed according those rules") and some Interval in between.
• The Meshline generation, that consist of filling each Interval while respecting enclosing MeshlinePolicies' specific rules.

Despite being actually just the last step of the whole process, this explanatory document is about the generation of Meshlines at Interval level.