largefiles: introduce "_lfcommithooks" to abstract pre-committing procedures...
largefiles: introduce "_lfcommithooks" to abstract pre-committing procedures
This changes allows to customize pre-committing procedures according
to conditions.
This patch uses "stack" with an element instead of flag like
"_isXXXXing" or so, because:
- the former works correctly even when customizations are nested, and
- ensuring at least one element can ignore empty check