Unbreak examples/check.ctl under MPI

[thchr]

I realized that the changes from #134 broke make check when compiled with MPI, because the symmetry-eigenvalue tests would try to run but fail because the code throws a transformed_overlap(..) is not yet implemented for MPI error.

This just disables that check if (using-mpi?) is true.

[thchr]

d0eaf7f is just an unrelated drive-by fix to some typos I noticed I had made in the docs.

[thchr]

Coincidentally - and not exactly relatedly, but figured I'd ask while I already have your attention - I have been meaning to ask:

If I wanted to make the compute_symmetry, etc. functions accessible in meep's Python interface for mpb, what would the steps be?
I had naively thought it might be possible to expose the C-functions from MPB via meep's python/solver.py - but looking in libpympb/pympb.cpp, I get the impression that virtually all the Python-accessible MPB methods are reimplemented from scratch there? Is that the only way to go about it, i.e. duplicate everything in the meep repo? (I don't have prior experience with SWIG, unfortunately)

[stevengj]

Anything in mpb/mpb/* is Scheme-dependent and not callable as a library, so unfortunately it needs to be ported to https://github.com/NanoComp/meep/blob/master/libpympb/pympb.cpp to be called from Python

[thchr]

Anything in mpb/mpb/* is Scheme-dependent and not callable as a library, so unfortunately it needs to be ported to https://github.com/NanoComp/meep/blob/master/libpympb/pympb.cpp to be called from Python

Okay, thanks for clarifying that 👍. I'll try to port the code to the meep repo one of these days.