Use more concise language, and make it clear where the precision
limits originate from. Also, use proper comments as opposed to
string literals.

Kelvin Loh authored 6 years ago and Joseph Weston committed 6 years ago

Change the criterion for array equal assertion
to the infinity norm of the residual.
Remove the kwant dependency of the test script.

This had been forgotten when bringing over Kwant's setup.py

Closes #10.

Kwant's setup.py handles config file parsing and a lot of edge
cases related to Cython, so we keep it around even if it is a bit
long.

Closes #3.

Closes #1.

Closes #9.

Setup fixes

See merge request kwant/mumpy!1

Mumps splits single precision, double precision etc. versions
into separate libraries, so we should link against them all

This is completely irrelevant for Mumps and is a hangover from copying
code from Kwant.