Ryan Tandy authored Jun 27, 2014 and Howard Chu committed Jun 30, 2014

Similar to #7858, another easy patch.

MDB is the name of the backend, LMDB is the name of the DB engine.
Also update some BerkeleyDB info.

Require that the page is dirty in the current txn,
not a parent txn.

Rename MDB -> LMDB
Integrate tool manpages

couldn't avoid ifdefs. Silence warnings.

On Windows64, long is the same size as int. Use size_t when we
need an actual 64 bit unsigned long.

Just use srand/rand, we don't care about the quality
of the random numbers, we just want some data.

Don't try this when working on the FreeDB. Again,
too much hassle to unkink the recursions...

Only loosen src page if it's actually dirty.
Refactor page refs in page_merge.

Pages that were dirtied and deleted in the same txn should be
reused, instead of consuming freeDB pages.

Similar to prev commit for mdb_node_move, the call of
mdb_page_serch_lowest() was leaving csrc unusable.

Was leaving stale info in dst cursor

Use num*20, chosen from empirical testing

Was skipping the overwrite in some cases, if the cmp function
said the new and old already matched. We should always perform
the overwrite anyway, since the cmp function may only be doing
a prefix compare and the data may actually be different.

added by mistake in 17c09fa4