Number formatting - FEATURES: updated - numbers.c: handles actual number

Number formatting - FEATURES: updated - numbers.c: handles actual number

Number formatting
- FEATURES: updated
- numbers.c: handles actual number formatting for both xsl:number and
  the format-number extension function.
- function.c: formatting moved to numbers.c
- transform.c: added xsl:number
- xslt.c: minor memory leak removed
- Makefile.am: added numbers.c and numbersInternals.h
Bjorn