* device/lib/pic16/Makefile.common.in: add --optimize-df to OPT_FLAGS

* device/lib/pic16/Makefile.common.in: add --optimize-df to OPT_FLAGS
* device/lib/pic16/libc/stdlib/itoa.c (new)
* device/lib/pic16/libc/stdlib/Makefile: have itoa.c built
* device/lib/pic16/libio/Makefile: exclude subdir according to
  ${subdir}.ignore for certain PICs (lacking e.g. i2c)
* device/lib/pic16/libio/i2c.ignore (new): pic18f1220 has no I2C support
* src/pic16/gen.c (genFunction): prevent annoying warning
* src/pic16/pcode.c: renamed stack_t to dynstack_t to prevent
  nameclashes on BeOS
* support/cpp2/cppmain.c (cpp_output_string): new
* support/cpp2/cpplib.c (_cpp_do__Pragma): fixed _Pragma (""),
  fixes bug 1116802

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3756 4a8a32a2-be11-0410-ad9d-d568d2c75423