Wait by default for one second after the login script

is complete before checking carrier.  If it's there,
the device supports carrier.  If it's not it doesn't.

Add the ``set cd'' command for deciding how soon to check
for carrier, and for deciding if carrier is REQUIRED.

The default has changed:  Pre 2.0 versions of ppp waited
for 1 second.  Version 2 didn't wait, but this causes
problems with some (few?) modems that don't assert carrier
immediately on reporting CONNECT.  The one second delay
is back now and can be removed with ``set cd 0''.

Bump the ppp version number in case this needs to be changed
again....

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