Pyyeti

This is another update primarily courtesy of Josh Ayers and his work on the pyyeti.nastran.bulk package:
- add rdsets to read SET case control commands
- add rdrvdof to read RVDOF & RVDOF1 cards

Josh also cleaned up many warnings during tests. Many, many thanks!! :-)

Minor update to SRS to be more clear on why Q > 0.5; add related exception and test. Many thanks to Jeremy Priest for pointing out the need for this! :-)

This update is primarily courtesy of Josh Ayers and his work on the `pyyeti.nastran` package:

- Many read routines in `bulk` can now follow "include" statements
- Nastran logical symbols can be read in via ``bulk.rdsymbols``
- Added general writing routines: ``bulk.wtcard8`` and ``bulk.wtcard16``
- Updated many routines to use new those two functions
- Added "smart" formatting to floating point fields via ``bulk.format_float8`` and ``bulk.format_float16``
- `wtcard8` and `wtcard16` use these routines
- Added more bulk data output routines to `bulk`:
- `wtmpc`, `wtspoints`, `wttabdmp1`, `wttload1`, `wttload2`, `wtconm2`
- Added automatic usage of "THRU" for some cards
- Added the ``op2.rdop2gpwg`` routine

Doc update for ``pyyeti.ode.SolveUnc`` to include equations for real uncoupled ODE

Fixed paths in some tutorials (thanks to P. Blelloch for pointing this out! :-)). Fix required moving "tests" --> "pyyeti/tests". This won't affect users, but developers will have to pay attention.

Miscellaneous other cleanings by Josh and myself.

A *huge* "Thank you!" to Josh for his work on this update!! :-)

Update reference to isspmatrix in pyyeti.expmint for compatibility with scipy version 1.11.1
- Some ode solvers use this routine

Thanks to Josh Ayers for this fix! :-)

- added wtassign and wtinclude functions to nastran.bulk; many thanks to Josh Ayers for this update! :-)
- updated documentation in frclim.calcAM and in frclim.ntfl
- cleaned up some other documentation (special thanks to Jeremy Priest for his help there!)

- added `wtmpc` and `wtspoints` functions to `nastran.bulk`; many thanks to Josh Ayers for this update! :-)
- updated documentation to add derivation of the Norton-Thevenin coupling equations to `frclim.ntfl`
- fixed some issues with `dsp.fixtime` and added a couple new options:
- `hold_previous_value` and `previous_value_tol`
- deleted the `fixdrift` option
- fixed a bug in cbcheck for perfectly 0.0 boundary stiffness for statically determinate models
- updated docs

This release is primarily for fixing some minor bugs/issues and updating the documentation:

- fdepsd has been updated to fix an issue that can cause an erroneous "ski slope" to appear in the lower frequencies. Many thanks to Vince G. for pointing this out! :-)
- as part of the fix, added the "detrend" option
- also made it mandatory that the optional arguments must be named

- Updated the CSTM output from the op2 reader to ensure it is a floating point array and not an integer array. Many thanks to Jeremy P. pointing this out! :-)

- Fixed an issue in cyclecount.getbins when there is only one amplitude (or mean) value after rainflow counting. This would cause "sigcount" to fail, for example, on this: ``cyclecount.sigcount(np.array([10, -10, 10, -10]))``