exthelper: reintroduce the ability to register filesets

Authored by mharbison72.

Description

exthelper: reintroduce the ability to register filesets

Same mechanism as revsets earlier in this series. The LFS extension is updated
to provide test coverage.

Details

Committed
mharbison72Dec 27 2018, 11:46 PM
Parents
rHG70ca0e846d25: exthelper: reintroduce the ability to register templates
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