Cumulative patch for pic16 port

Cumulative patch for pic16 port
* src/pic16/device.h (typedef PIC16_device) modified fields for
defining microcontrollers,
* src/pic16/device.c: added new info for all devices in Pics16 array,
* src/pic16/gen.c (genPcall): fixed bug that caused the return label
to be optimised out by the pCode optimiser,
* src/pic16/glue.c (pic16emitRegularMap): treat implicit aggragates
specially, bug reported by G.M. Gallant,
* src/pic16/pcode.c (pic16_newpCodeLabelFORCE): NEW, marks a label
as force'd so that cannot be optimised out by pCode optimiser,
* src/pic16/pcode.c,
* src/pic16/pcodepeeph.c,
* src/pic16/pcoderegs.c: many modifications to re-enable peepholes,
they are disabled by default, but can be enabled explicit with
command argument --denable-peeps, for testing,
* device/lib/pic16/startup/Makefile: added --no-peep,--pomit-config-words,
--pomit-ivt in COMPILE_FLAGS

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3354 4a8a32a2-be11-0410-ad9d-d568d2c75423