Lower tolerance in BAMG to avoid misidentification of overlapping edges

[prj-]

Fix #319

[cmdoug]

Here is a test case. See the chevalier_etal_2024 example.

[prj-]

Here is a test case. See the chevalier_etal_2024 example.

On my end, this test case is failing with:

$ FreeFem++-mpi -v 0 importgmsh.md -gmshdir examples/chevalier_etal_2024 -dir $workdir -mi nozzle_lg.geo
  Loading 'nozzle_lg.geo' in 'examples/chevalier_etal_2024/'.
  Calling GMSH to build .msh file from .geo file.
  current line = 29 mpirank 0 / 1
Assertion fail : (area > 0)
	line :303, in file ./include/fem.hpp
Assertion fail : (area > 0)
	line :303, in file ./include/fem.hpp
 err code 6 ,  mpirank 0

But that's unrelated to BAMG (and the present PR), isn't it?

[cmdoug]

Sorry about that, tried to rush something to you. I am heading out on vacation for the next week, but will follow up later this month when I have time to look more closely.

[prj-]

Any update on this, @cmdoug?

[cmdoug]

Sorry, not yet. Will get to it this week.

[cmdoug]

@prj- Sorry for that. I just pushed a fix get past that issue. Seems like this addresses the issue with BAMG, but there is also bug in mortar construction error that will be problematic without an adjustment to some tolerances in fem.cpp as well.