(vc-mode-line): Don't write-protect a

(vc-mode-line): Don't write-protect a
VC-Log buffer.  Better mode line text for initial comments.
Streamlined the function.
(vc-locking-user): Consider a cvs file "locked"
if its status is either 'locally-modified or 'needs-merge.
(vc-workfile-version): Catch 'found when calling vc-find-cvs-master.
(vc-fetch-master-properties): Handle cvs status "Needs Checkout".
This is intended for future use.
(vc-fetch-master-properties): Shrink the window
that displays the error message.