sig_float: Add .latex() function to format the numbers

[steph1111]

See discussion

[schrodinstein]

Replied

[steph1111]

This is working well 0.08206 \; L \cdot atm \cdot mol^{-1} \cdot K^{-1}

[steph1111]

Units in the denominator but not numerator:

f = sig_float("300.0", {"s":-1})
print(f.latex(format=2))

300.0\frac{}{s}

[steph1111]

f = sig_float("300.0", {"s":-1})
print(f.latex(format=2))
print(f.latex(format=1))

300.0 \frac {1}{s}
300.0 \; s^{-1}

[steph1111]

Updated implicated of latex(), It works well now