Adds CompareAndClear mutation. If the given parameter is equal to the
current value of the key, the key is cleared. At client, the mutation
is added to the operation stack. Hence if the mutation evaluates to
clear, we only get to know so when `read()` evaluates the stack in
`RYWIterator::kv()`, which is unlike what we currently do for typical
ClearRange.
Remove the use of relative paths. A header at foo/bar.h could be included by
files under foo/ with "bar.h", but would be included everywhere else as
"foo/bar.h". Adjust so that every include references such a header with the
latter form.
Signed-off-by: Robert Escriva <rescriva@dropbox.com>
mpilman