Jean-Marc Lasgouttes 1d08af621d Implement on screen numbering for Subequation module
The module subequation allows to number equations in the "Subfigure"
inset to be numbered (1a), (1b), (1c), etc.

To implement this on screen, we need to redefine temporarily the
"equation" counter to use this different numbering.

To this end, implement Counters::copy method that can be used to
backup full counter definitions.

Fixes bug #12567.
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