getenv command

[Stuart Allen]

Hi all

I've just added a new command 'getenv' This command is just a simple
wrapper around the C function getenv and it allows the contents of an
environment variable to be copied into a JACL string variable.
Although it is copied automatically into 'user_id', REMOTE_USER is an
example of the type of environment variable that is passed to the web
server. I've added this command for a relatively obscure login
mechanism I'm going to be supporting so it probably isn't anything to
worry about to much.

I've put an example of it's use in script.jacl.

Regards,
Stuart