#include <stdlib.h> to get malloc & co various places,
#include <ac/string.h> to get strlen & co in (liblutil/setproctitle.c),
declare ch_malloc & co (slurp.h), avl_find_lin (avl.h), Malloc (ud/edit.c).
Also changed ch_malloc & co from char* to void* functions.
adds POSIX RegEx (and removes BSD re_comp/re_exec) support.
* POSIX RegEx is not currently included in the distribution, however
we will probably add Henry Spencer's REGEX library soon.
* ACL Group functionality is also included in this merge!