Intermittent failures when running tests

[StephenCzarnecki]

Tests have started to have intermittent heap corruption errors. So far it doesn't seem to correlate to any specific test or architecture.

For example see results of this action in github: https://github.com/LBNL-ETA/WinCalc/actions/runs/12437387711/job/34727139596

In this case the failing test is:

Image	Error	Test
Windows 2019-x64	Exit code 0xc0000374	Test_2_layers_nfrc_102_air_perfectly_diffusing_shade_pella_white_venetian_blind_slat.Test_Optical_0_permeability_factor
Windows 2022-x86	SegFault	Test_2_layers_laminate_nfrc_18000_air_NFRC_102_quarter_basis.Test_Optical
Windows 2022-x64	SegFault	Test_2_layers_woven_pella_white_venetian_blind_slat_user_geometry_air_nfrc_102.Test_Optical
Ubuntu 24.04-aarch64	malloc(): invalid size (unsorted)	Test_2_layers_laminate_nfrc_18000_air_NFRC_102_quarter_basis.Test_Thermal

Try to figure out what is going on and fix it.

[StephenCzarnecki]

For comparison see https://github.com/LBNL-ETA/WinCalc/actions/runs/12440164750 which is the same code (a space was added to the readme file) but here everything passes except Windows 2019-x86 which previously did pass.

In this run Windows 2019-x86 fails on Test_2_layers_nfrc_102_air_perfectly_diffusing_shade_pella_white_venetian_blind_slat.Test_Optical_75_permeability_factor with Exception: SegFault