nmh 1.8 -- repeated Welcome message unless there is a context change

[bergman]

Many thanks for the new release -- it's great to see such dedication.

In my environment, I set $MHCONTEXT dynamically at login, so that I can
have different contexts for different sessions (ie., GUI desktop, ssh,
tty login) on the same machine, via:

        export MHCONTEXT=~/Mail/.mhcontext-`tty|sed -e "s,.dev.,," -e "s,/,.,"`

I see that nmh commands are reading the $MHCONTEXT file, parsing the line
"Version: nmh-1.7.1" and printing the Welcome message, but not updating
the file unless there is a context change:

        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ echo $MHCONTEXT
        /home/bergman/Mail/.mhcontext-pts.0
        [bergman@rocoto ~]$ cat $MHCONTEXT
        Current-Folder: Work
        Version: nmh-1.7.1
        [bergman@rocoto ~]$ inc
        ========================================================================
        Welcome to nmh version 1.8
        
        See the release notes in /usr/share/doc/nmh/NEWS
        
        Send bug reports, questions, suggestions, and patches to
        nmh-workers@nongnu.org.  That mailing list is relatively quiet, so user
        questions are encouraged.  Users are also encouraged to subscribe, and
        view the archives, at https://lists.gnu.org/mailman/listinfo/nmh-workers
        
        This message will not be repeated until nmh is next updated.
        ========================================================================
        
        Press enter to continue:
        
        inc: no mail to incorporate
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ cat $MHCONTEXT
        Current-Folder: Work
        Version: nmh-1.7.1
        [bergman@rocoto ~]$ inc
        ========================================================================
        Welcome to nmh version 1.8
   {SNIP!}      
        Press enter to continue:
        
        inc: no mail to incorporate
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ folder +Work
        ========================================================================
        Welcome to nmh version 1.8
   {SNIP!}      
        Press enter to continue:
        
        Work+ has no messages       ;        (others).
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ 
        [bergman@rocoto ~]$ inc
        inc: no mail to incorporate
        [bergman@rocoto ~]$ cat $MHCONTEXT
        Current-Folder: Work
        Version: nmh-1.8
        
-- 
Mark Bergman    Biker, Rock Climber, SCUBA Diver, Unix mechanic, IATSE #1 
Stagehand
'94 Yamaha GTS1000A^1                                         2015 Aprilia 
Caponord
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