fehmpytests heat_pipe fails on windows

[millerta]

This seems to be an issue with the python scripts which are only writing one of the 2 subset tests under windows.

Running without python, the linux and windows vapor and liquid flux pairs match VV at Days .1000E+05 Note there is some precision/roundoff difference but values are good within tolerance of VV using 12.6e

These are VV files created from VV perl scripts.

==> ../output/heat_pipe_fdm.flux <==
Internode Fluxes (kg/s) for heat pipe problem
Days 0.100000E+05
Count   Vapor flux  Liquid flux
    1   5.156700e-005   -4.104530e-007
    2   5.158350e-005   -4.270810e-007
    3   5.175380e-005   -5.991410e-007
    4   5.217240e-005   -1.023580e-006
    5   5.219110e-005   -1.043040e-006
    6   5.219110e-005   -1.043040e-006

==> ../output/heat_pipe_fe.flux <==
Internode Fluxes (kg/s) for heat pipe problem
Days 0.100000E+05
Count   Vapor flux  Liquid flux
    1   5.156690e-005   -4.103200e-007
    2   5.157490e-005   -4.183730e-007
    3   5.176070e-005   -6.060130e-007
    4   5.217260e-005   -1.023830e-006
    5   5.219090e-005   -1.042920e-006
    6   5.219090e-005   -1.042920e-006

[millerta]

This working on windows and linux now.