Add Nepalese Number system format.

[ajiragroup]

In Nepal, the number system is a little different.
The number format is like this:
#,##,##,##,##,###.##
The numbers before decimal are read as this (from right)
ones - tens - hundred, thousand - ten thousand, Lakh - Ten Lakh, Crore - Ten Crore, Arba - Ten Arba, Kharba - Ten Kharba, Nil - Ten Nil and so on.
This goes on well beyond that will ever be necessary.

This can be added as a new locale en_NP

For further reference :

https://en.wikipedia.org/wiki/Numbers_in_Nepali_language