Log Message:
Update to 0.9.18
----------------
LMDB 0.9.18 Release (2016/02/05)
	Fix robust mutex detection on glibc 2.10-11 (ITS#8330)
	Fix page_search_root assert on FreeDB (ITS#8336)
	Fix MDB_APPENDDUP vs. rewrite(single item) (ITS#8334)
	Fix mdb_copy of large files on Windows
	Fix subcursor move after delete (ITS#8355)
	Fix mdb_midl_shirnk off-by-one (ITS#8363)
	Check for utf8_to_utf16 failures (ITS#7992)
	Catch strdup failure in mdb_dbi_open
	Build
		Additional makefile var tweaks (ITS#8169)
	Documentation
		Add Getting Started page
		Update WRITEMAP description