Use printf of find rather than passing to stat for ssh
Merge pull request #121 from steoxley/use_printf_rather_than_stat

fcm make: ssh extract: find printf instead of find exec stat
Admin and hook improvements

Test batteries for hooks.
Improve diagnostics for hooks. Keep logs.
Hooks to work best under Subversion 1.8+.
Clean options for hook installation.
Add modified `svnperms.py` in distribution.
Trac 0.12+ changeset added and modified notification.
Trac URL template.
Trac comment edit permission.