Renaming glabel(8) labels

Hi Pawel,

I've recently had the use case of changing the glabel(8) label of
a disk.  I noticed that there is no supported way to do that.  What
worked is destroying and then recreating the label, though that
requires first removing all consumers of the label.  It's also
rather scary as there is no documentation on whether destroying the
label and then recreating it would work.

Is there a better way to change a glabel(8) label?  If not, could
you implement a command to do so?

Thank you for your help.

Yours,
Robert Clausecker

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