Recent minor changes

[Alan DeKok]

  Version 3 had *most* configuration things pre-compiled.  e.g.

	"%{sql: SELECT .. %{User-Name} ...}"

  would check that the "sql" module existed, and the User-Name attribute
existed.  This worked for everything except regular expressions.  I've
just pushed a minor change which fixes that:

	if (User-Name =~ /%{Blah-Blah}/) { ...

  is now an error.  The server will refuse to start, and will print out
a descriptive error message.

  Alan DeKok.