new program for emergency addkey; run without args for usage

doc/src: major doc/help text revamp

also removed some dead code from compile (pre PTA days)

auth, doc/3: print useful information when no command given

Merge branch 'system-install'

Merge branch 'easy-install'

Merge branch 'master' into delegation

compile+conf: allow lists (@listname) for reponames too

why should just usernames have all the fun :)  The "expand_userlist" function
is now "expand_list" and serves generically.  The example conf has also been
updated correspondingly