#18 Basic Auth support

[Don Mahurin]

Basic Auth support based on uclinux boa changes.

Some differences:

- crypt is used instead of the internal md5
implementation (though I left it ifdefd out).

- the auth files are htpasswd compatible

- The arg order is like apache AuthFile

- auth file can be prefixed with an auth type
(Currently None or Basic).

- 'Basic:' means use basic athentication with system
passwords.

- A parent directory auth applies to children too,
unless defined more specifically.

Example

Auth / /auth/default.auth
Auth /images None:
Auth /pub None:
Auth /pages Basic:/auth/pages.auth
Auth /pages/private Basic:/auth/private.auth

[Don Mahurin]

boa-0.94.14rc19 auth patch

[Don Mahurin]

boa-0.94.14rc17 auth patch file