- "lock" command for locking the session

- "not" (!) implementing in grants

- error on /DNS
ac: connection establishing
Use of uninitialized value in hash element at /u/rse/ac/src/ac line 1216.
Use of uninitialized value in concatenation (.) or string at /u/rse/ac/src/ac line 1216.
ac:ERROR: invalid login method "" 
ac:ERROR: Can't call method "delwin" on an undefined value 

- support not in grants with "!xx"
- access levels/tags:
  grant { @gsoc[0] } { @is };
  grant { @gsoc[1] } { rse cschug };
- display order
  order { @is @gsoc } { @is };
  order { @gsoc @is } { @gsoc };
- switch user
  superuser { rse cschug };
  grant { SUPERUSER } { rse };
- who's online, last login, busy time, ...$ who
- options: -+include, -+shell$(cmd), -+overrideentry 
- remove special case of "hostname" and make this the first argument of login args
- shell-style $(cmd) einbauen (und dafuer $ENVs rauswerfen?)
- usage of #1 for backreferences in expected strings should be locally scoped?!
- more expect methods

- SIGWINCH support
- provide last-login information
- option -g for starting in CUI and staying there

- add ac.pod documentation

- better code commenting
- better consistrency checks
- better error checking, especially line/col info on parse errors