Pyyeti

Documentation updates

Added the "encoding" option to the read routines in `pyyeti.nastran.bulk.`

Small update to fix a couple issues in datacursor: all-NaN vectors and ax[vh]line handling

Add the "forms" option to `pyyeti.nastran.bulk.wtextseout`. The new default is now to mark the mass, stiffness, and damping matrices as symmetric.

Release to fix encoding issue on Windows:
- update guitools.read_text_file to use UTF-8 encoding
- primarily impacts nastran.bulk.rd* routines

Many thanks to A. Amar for pointing out the encoding issue! :)

Enhanced the `pyyeti.nastran.bulk.rdeigen` function. It now accepts the `search_strings` and `regex` options.


v.1.4.3.1
Added a CLA tutorial.