* device/lib/pic/libm: NEW, added math library functions

* device/lib/pic/libm: NEW, added math library functions
* device/lib/pic/libsdcc: NEW; added float support functions
* device/lib/pic/{Makefile.in,configure.in,configure}: added libm/
* device/include/pic/{limits.h,errno.h,sdcc-lib.h,float.h,math.h}:
  NEW, added math related headers
* device/include/asm/pic/features.h: NEW
* src/pic/gen.c (emitpcode_real): emit warning on NULL pCodeOp,
  (popGet): allow larger offsets for AOP_PCODE,
  (genDataPointerSet): handle literals explicitly, more debug output,
  (genAssign): fixed for float using aopLiteral ;-)
* src/pic/glue.c (pic14createInterruptVect): inserted pagesel before
  GOTO initialisation routine
* src/pic/pcoderegs.c (pCodeRegMapLiveRangesInFlow): set wasUsed
  flag on registers, fixes #1469043 (local variables do not work)
* src/pic/main.c (_pic14_do_link),
* src/pic16/main.c (_pic16_linkEdit): use fullDstFileName if
  available

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4250 4a8a32a2-be11-0410-ad9d-d568d2c75423