Merge pull request #68 from sunyc/master

Add the missing old_qsort file.
Merge pull request #69 from sunyc/master

Fix problems reported by valgrind, and typos.
call_out loop protection is now optional

fixes issue #58
Merge pull request #71 from Voltara/issue58-optional_call_out_loop_protection

add CALLOUT_LOOP_PROTECTION.
Merge pull request #70 from sunyc/master

make DEBUGMALLOC_EXTENSIONS work under release build
Merge remote-tracking branch 'upstream/next-2.27'