* device/include/float.h: added __INFINITY

* device/include/float.h: added __INFINITY
* device/lib/_fsadd.c: handle overflows
* device/lib/_fsmul.c,
* device/lib/_fsdiv.c: use __INFINITY
* device/lib/_fseq.c,
* device/lib/_fsneq.c: handle -0.0
* sim/ucsim/s51.src/uc89c51r.cc,
* sim/ucsim/s51.src/uc89c51rcl.h: bugfix auxr should be auxr1
* sim/ucsim/sim.src/hwcl.h: */* confuses VC
* src/mcs51/gen.c (genSend): fixed bug with --xstack
* support/regression/ports/mcs51-xstack-auto/spec.mk: print floats
* support/regression/tests/snprintf.c: test bug with --xstack

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@5164 4a8a32a2-be11-0410-ad9d-d568d2c75423