* device/include/malloc.h: removed init_dynamic_memory

* device/include/malloc.h: removed init_dynamic_memory
* device/lib/malloc.c: made init_dynamic_memory static and automatically
  call it once from malloc. Also use _sdcc_heap[] from _heap.c
* device/lib/_heap.c: new, added, contains _sdcc_heap[]
* device/lib/libsdcc.lib,
* device/lib/Makefile.in,
* support/regression/ports/mcs51-xstack-auto/spec.mk: added _heap.c
* doc/sdccman.lyx: documented use of new _heap.c
* support/regression/tests/malloc.c: removed init_dynamic_memory
* src/cdbFile.c(spacesToUnderscores): new function,
  (cdbWriteEndFunction, cdbWriteCLine): use spacesToUnderscores, fixes bug
  1068030

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@4508 4a8a32a2-be11-0410-ad9d-d568d2c75423