Fully revert the change to GET_MULTIPLE

GET_MULTIPLE was broken

Allow C_EOF flag to be stale

Optimize mdb_page_search_root(PS_LAST) when cursor is already near
last position, ignoring C_EOF flag for now.

ITS#8538 - Update information on the interval keyword, as it affects refreshAndPersist in very specific circumstances

Howard Chu authored 8 years ago and Quanah Gibson-Mount committed 8 years ago

Must NULL out indexing cursors when closing tool txn

ITS#8539 Fix "make its"/"make regressions" to actually run the regression suite for bdb/hdb/mdb backends

ITS#8521 - Updates to test to ensure it fails where it should fail and succeeds where it should succeed.
Reference ITS#8281 as well, since these are related

Doesn't have POSIX robust mutexes - GNU userland on BSD kernel

- DISTRIBUTE_GROUP_DOC makes doxygen give several fields the
  same doc: mn_hi + mn_lo in MDB_node.
- With mdb_mutex_t + mdb_mutexref_t, instead split them up.