Unify code for non decimal literals and decimal literals.

[juliapath]

Decimal literals are currently handled separately from binary, octal and hex literals. It should be possible to handle all these together. Furthermore, since I did not really look at those parts of the code, when implementing the optional padding, super and subscripts the behaviour of decimal numbers and other numbers diverged a bit.

• Leading zeros and the padded argument given to the command do not change the padding behaviour of non-decimal numbers.
• Support for superscript non-decimal numbers? We have all the letters we need in Unicode (which is not the case for subscripts).

[ideasman42]

Committed, ad158248678560da57e02d146b40975acd69bccf closing.