- add show_cursor config option (idea from Cheryl Homiak)
- autoconf/automake update
- replace abook_malloc, abook_realloc and my_free with new xmalloc routines
+ - replace strdup with xstrdup
- update for abook_rl (abook_readline)
- make it compile with tcc (Tiny C Compiler)
- code cleanups and minor fixes