* src/pic16/devices.inc,

* src/pic16/devices.inc,
* device/include/pic16/pic18f[24][23]21.h,
* device/include/pic16/pic18fregs.h,
* device/lib/pic16/libdev/pic18f[24][23]21.c,
* device/lib/pic16/pics.all: added support for the 18f[24][23]21 family
* device/lib/pic16/libio/adc.ignore,
* device/lib/pic16/libio/i2c.ignore,
* device/lib/pic16/libio/usart.ignore: do not build I/O lib for new
  family, as gputils do not yet support the devices
* device/lib/pic16/Makefile.subdir: ignore errors on install
* support/scripts/inc2h-pic16.pl: script to generate pic16 device
  headers and libraries from gputils .inc files

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4603 4a8a32a2-be11-0410-ad9d-d568d2c75423