- create capabilites provided by both tftp and atftp
(bnc#801481 or bnc#725378)

- change ownership of /srv/tftpboot, because atftpd running as
tftp:tftp can't write to that directory
- create pid directory on service start
- manpage changes:
* substitute /tftpboot with /srv/tftpboot
* default user is now tftp:tftp
* added patches:
atftp-0.7-default_user_man.patch
atftp-0.7-default_dir_man.patch

- use Vladimir Nadvornik's heuristic for packet retransmission
by default (see bnc#774376)
The RFC1350 compliant behaviour stays optional.
(added atftp-0.7-ack_heuristic.patch)
- merged the two sorcerer's apprentice syndrome patches to one
(removed atftp-0.7-prevent-sas.patch)