Problems at shutdown

[Andy Green]

Bernhard Fischer wrote:

Hi Bernhard -

> Understood. We have USE_foobar nowadays, all USAGE_barbaz in usage.h
> have to be removed piece by piece.

Alright now I am with you.

>>> Please resend (would be awesome if you could cleanup the other uses of
>>> USAGE_MTAB while you're at it), thanks

I decided to clean up the whole usage.h for this issue since I think I 
understood the situation well enough to try it.  The original two 
changes are in this diff too using the USE_ system now.

Two bugs came out of it

  - CONFIG_FEATURE_MOUNT_FORCE never exists

It is for umount, not mount despite the name.  In the code for umount, 
it seems to be enabled always.  So I changed usage.h to reflect that.

  - CONFIG_FEATURE_TAR_EXCLUDE never exists

The -X switch is therefore never shown in the --help for tar up until 
now.  But it seems the feature is supported in the code for tar 
depending on CONFIG_FEATURE_TAR_FROM.  So I changed this in usage.h too 
to depend on the same CONFIG_.

There are two instances remaining of USAGE_ where there is some logic 
done to work out what to allow and it doesn't fit in the USE_SKIP way, 
so I leave those.

-Andy
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