Added gcc backtrace symbol demangling with __cxa_demangle()
Some alloca-related fixes

Remove HAVE_ALLOCA due to it's unused
Add conditiondl #include <alloc.h> to kdebug.cpp
Small fixes to kdebug.cpp
Add libbfd support as a backend for kdBacktrace()
Remove crappy backtrace_symbols from tdeio
Merge branch 'master' into backtrace-improve

Conflicts:
	CMakeLists.txt
	tdeio/tdeio/CMakeLists.txt
	tdeio/tdeio/slavebase.cpp
Return and improve the HAVE_ALLOCA test
Merge branch 'master' into backtrace-improve
Merge branch 'master' into backtrace-improve
tdecore: unde the knDebug macro than compiling kdebug.cpp
Merge branch 'backtrace-improve'

Conflicts:
	CMakeLists.txt
	tdecore/kdebug.cpp
	tdecore/kdebug.h
	tdeio/tdeio/slavebase.cpp