+ s/extern/EXTERN/ in include/conf
+ implemented class{} from scratch; it's almost done,
  I only need to add limit checking code
+ added nice syntax e.g. number_per_ip = 3, global:5;
+ added some aliases ie host_limit === number_per_ip,
  userhost_limit === number_per_userhost
  (replaces max_local & max_global mess)
+ check example.conf for more details.

- added dynamically extensible conf parser (compiles ok); enough to start
  modularising general{} -> general.c, auth{} -> auth.c and so on.