Merge pull request #1454 from nschloe/fix-new-numpy

version bump

np.string_ -> np.bytes_

require python 3.8

lint fixes

try building with pyproject.toml

Merge pull request #1303 from nschloe/nastran-fix

nastran: better handling of large-fixed

more nastran fixes

nastran fixes for long format

version bump

another nastran fix

more nastran fixes

some nastran fixes for continuation lines

Merge pull request #1302 from nschloe/flac-empty-lines