~/.tn5250rc, command-line parsing...

Hello everyone.

I've been sitting on this half-finished patch for quite some time, so I've
finally bit the bullet, finished it, tested it, and posted it.  It's a big
change but the code is pretty clean, so there shouldn't be too many bugs.

The version in CVS now parses some rc files during startup, in this order:
1) $(sysconfdir)/tn5250rc (usually /usr/local/etc/tn5250rc)
2) ~/.tn5250rc

Then procedes to parse the command-line arguments.  The configuration files
have the following format:

# This is a comment
name = value

# The below is shorthand for 'name = on'
+name

# The below is shorthand for 'name = off'
-name

# This sets group.name to `on'
group.name = on
# So does this
group {
        name = on
}
# and this
+group.name

The command-line options have been melded into this as well, so you can do
this:

tn5250 +underscores map=37 localhost:1975

Additionally, this uses all options set within a group:

tn5250 group

This is good for setting up different AS/400 sessions, for example, like this:

AS4001 {
  host = as.400.1.com
  map = 37
  env.TERM = IBM-3812-1
}
AS4002 {
  host = as.400.2.com
  map = 284
  +underscores
}

Then:
tn5250 AS4002

You can even do:

tn5250 -underscores AS4002

Here are the currently supported options:

+/-underscores       (old -u option)
trace=FILE           (old -t option)
host=HOST            (old host parameter.  From the command-line
                      'host=' is optional)
session=NAME         (old -s option)
env.TERM=TERM        (old -y option)
+version             (old -V option)
+help                (old -h option)

everything in env.* gets sent to the AS400 as an environment string, so now
you can specify arbitrary telnet exit strings.

I realize this is a big change, I will back it out of CVS if necessary but I
think it's much more flexible and forward-looking a scheme.  We now have a
vehicle for implementing keyboard mapping (e.g. key.enter = field exit) and
lots of odds and ends options (window-title = My AS/400 Session) which wouldn't
have fit well into the old scheme.  This should also interface very simply
with scripting languages such as Perl and Guile when we add support for them.

Please bang on it and make sure that it's stable (I've tested nearly every
combination I can think of, but then again...)

-Jay 'Eraserhead' Felice

P.S. This breaks xt5250.  I will fix to-morrow.
P.S.S.  It's case sensitive.  I just realized that's probably a bad idea.

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