Add the sqlite_memstat extension - an eponymous virtual table that shows

memory usages statistics for SQLite.

FossilOrigin-Name: 954ef61f6a02532e72c815208ec839310f1e00d69e0003cc6f5426f0559229d1

diff --cc manifest
index afd4f4d11ea6280e9df7a464890754d39ceec696,330f25ebf9ed13e252baa2278041c0315b358f6f..420b2640887975420e0c1e3f02f9acadf5ff6d38
--- 1/manifest
--- 2/manifest
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@@@ -1,5 -1,5 +1,5 @@@
- C Disallow\sthe\suse\sof\swindow\sfunctions\sin\sthe\srecursive\spart\sof\sa\srecursive\sCTE.
- D 2018-09-27T12:14:15.056
 -C Enhancements\sto\ssqlite_memstat:\n(1)\sAdd\san\sextra\s"schema"\scolumn\sto\sshow\sthe\sschema\sname\sfor\sZIPVFS\sstats.\n(2)\sOnly\sshow\sZIPVFS\sstats\sto\sschema\sthat\suse\sZIPVFS\n(3)\sPut\sa\sNULL\sin\sunused\scolumns\sof\sthe\soutput.
 -D 2018-09-27T16:57:42.381
++C Add\sthe\ssqlite_memstat\sextension\s-\san\seponymous\svirtual\stable\sthat\sshows\nmemory\susages\sstatistics\sfor\sSQLite.
++D 2018-09-27T17:03:03.584
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diff --cc manifest.uuid
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--- 2/manifest.uuid
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