Add wtperf configuration for shared cache testing.
Fix for doxygen-1.8.8: it doesn't know how to treat "wiredtiger.in" without help.
Document that bulk load cursors are non-transactional.
Make "-O3 -g" the default build flags (again), including for C++ (api/leveldb).
Limit the maximum compression ratio our raw zlib implementation will allow.  Once we have taken 20x the maximum page size, stop.  This prevents pathological behavior in sythetic workloads where a page is forced out of cache, then compresses into a single page on disk, and we repeat for every update.
Limit range in shared cache wtperf configuration.

Avoids using too much disk space.
Add support to run zlib-noraw compression.
long line complaint
On error in wiredtiger_open, don't try to free buffers after closing the connection handle.
LSM tombstones are no longer empty values, remove that caveat from
the LSM page.
I don't expect to fix named checkpoints in LSM, tombstones were the
caveat we planned to fix.
Add a section on choosing a storage option.
Merge branch 'develop' into force-all