Reduce memory requirements for regression tests after PR #1008

[andrew-platt]

This PR is not ready to merge yet.

Feature or improvement description
PR #1008 introduced potentially larger memory requirements for the SeaState than previously required for HydroDyn. This causes GitHub actions to fail when memory is exhausted.

Also minor fix so that the docs will build on readthedocs.org.

Related issue, if one exists
#1008

Impacted areas of the software
No code changes are introduced with this PR.

Additional supporting information
Additional changes may be required after this PR is started.

Test results, if applicable
Many tests involving SeaState have been changed to use a smaller WaveTMax so as to reduce memory requirements. This causes the wave elevation data to look significantly different because of the way the random numbers are used during generation of the wave spectrum. As a result, many tests will need updating.

• Verify meet memory requirements. Reduce grid sizes in SeaState further if needed.
• Verify we are using RANLUX in all SeaState cases (should have occured with Update HydroDyn driver cases to use RANLUX r-test#96)
• Update regression test results
• While we are at it, remove the .out files in favor of keeping only the .outb files. Remove extra stuff (summary etc) from regression tests.

[andrew-platt]

The following cases were modified:

Name	WaveTMax original	WaveTMax new
5MW_ITIBarge_DLL_WTurb_WavesIrr	3630	600
5MW_OC3Mnpl_DLL_WTurb_WavesIrr	3630	600
5MW_OC3Spar_DLL_WTurb_WavesIrr	3630	600
5MW_OC3Trpd_DLL_WSt_WavesReg	3630	600
5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	3630	600
5MW_OC4Semi_Linear	4600	600
5MW_OC4Semi_WSt_WavesWN	4600	600
5MW_TLP_DLL_WTurb_WavesIrr_WavesMulti	3630	600
StC_test_OC4Semi	4600	600
hd_5MW_ITIBarge_DLL_WTurb_WavesIrr	3630	600
hd_5MW_OC3Spar_DLL_WTurb_WavesIrr	3630	600
hd_5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	3630	600
hd_5MW_OC4Semi_WSt_WavesWN	4600	600
hd_5MW_TLP_DLL_WTurb_WavesIrr_WavesMulti	3630	600
hd_NBodyMod1	4600	600
hd_NBodyMod2	4600	600
hd_NBodyMod3	4600	600
hd_OC3tripod_offshore_fixedbottom_wavesirr	3630	600
py_hd_5MW_OC4Semi_WSt_WavesWN	4600	600
seastate_1	4600	600
seastate_wavemod5	4600	600
seastate_wr_kin1	4600	600

[andrew-platt]

@luwang00, can you review this?

[luwang00]

@luwang00, can you review this?

Hi @andrew-platt, the changes look good to me.