Keep sindex block when initiating post construction. Could help with #2087.
Handle group/ungroup
Merge branch 'daniel_2073' into daniel_2087
Merge branch 'next' into daniel_2087
Just added a TODO
fixed info
naming
Some optimizations, including debug code.
Temporarily disabled unsaved change throttling
Added and used page_cache_index_write_sink_t, added new_mutex_t, did not push through to index_write.
Removed some irksome spacing around our precious reference ampersands.
Added reset methods to rwlock_in_line_t and new_mutex_in_line_t.
Passed in and IGNORED and passed dummy values for new_mutex_in_line_t parameter of index_write, now there are RSIs to fix.
Merge branch 'next' into daniel_2087
Replaced NULL index_write parameter with a dummy_acq in data block manager.
Replaced NULL index_write parameter with a dummy_acq in prep_serializer.
Made the merger serializer use a dummy acq temporarily instead of a NULL.
Used the new_mutex_in_line_t in log_serializer_t::index_write.
Fixed const reference usage, brace usage.
Assign new UUIDs to backfilled sindexes. Also updated a comment.