* src/*.c, src/pic16/{gen.c,glue.c,main.c}: applied Vangelis

* src/*.c, src/pic16/{gen.c,glue.c,main.c}: applied Vangelis
  Rokas' patch to add the new fixed point type "__fixed16x16"
* device/lib/pic16/libsdcc/fixed16x16: added Vangelis' support
  functions for __fixed16x16 arithmetics
* device/lib/pic16: reimplemented the build system to support
  a separate build directory, better handling of libio (create
  the library in a separate subdir for each architecture) and
  easier configuration (centralized in Makefile.common)

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3838 4a8a32a2-be11-0410-ad9d-d568d2c75423