Engineering notation as decimal point (R notation)

[diegoherranz]

Thanks for this tool. It does basically what we need.

In the Electronics world, it is very common to use the "R notation" where the decimal separator gets replaced by the prefix. You can read more about it here: https://en.wikipedia.org/wiki/RKM_code

This is the behaviour we would desire:

>>> EngNumber('2k2')
2.20k
>>> EngUnit('4u7F')
4.70uF
>>> EngUnit('2R2')
2.20R

Would it be possible to add this capability?

Thanks!