BUG:units for Uv & U1, convective thermal coefficient for Faiman and PVsyst, m/s should be in denominator

[mikofski]

Describe the bug
the units are unclear, m/s should be in the denominator, but looks like numerator

pvlib-python/pvlib/temperature.py

Line 216 in e526b55

in :eq:`pvsyst` [(W/m^2 C)(m/s)].

and

pvlib-python/pvlib/temperature.py

Line 306 in e526b55

determined by Faiman for 7 silicon modules. [(W/m^2 C)(m/s)].

Expected behavior
There probably isn't a standard, and we could argue, but IMHO the units should always be as explict as possible. I like the way wikipedia makes them very explicit using parentheses

Screenshots
pvsyst:

Faiman:

Versions:

• pvlib.__version__: e526b55

Additional context
IMHO these units should uses parentheses like Wikipedia does for clarity:

• Uv & U1: [W/(m^2 K)/(m/s)] or [W/m^2/K/(m/s)] or [(W/m^2)/K/(m/s)]
• Uc & U0: [W/(m^2 K)] or [W/m^2/K] or [(W/m^2)/K]

[mikofski]

also FYI, the HTML code ² makes a superscript 2 similar to <sup>2</sup>, there's also ³ too, EG:

• W/m^2 = W/m² = W/m²
• W/m^3 = W/m³ = W/m³

[adriesse]

There's also unicode...