Add new API function sqlite3_db_cacheflush().

FossilOrigin-Name: ad80d3073388c59f67171720efc6ef766e19886f

diff --cc manifest
index befa28989a91c9dd574ea2c5f239324b8853b834,0497ff0353acb628e72b953ccbc824078dd32fed..345e6cee83aa73eedf545ba3d81db5960f6ee89f
--- 1/manifest
--- 2/manifest
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@@@ -1,6 -1,6 +1,6 @@@
- C Add\sthe\s--enable-editline\soption\sto\svarious\sautoconf\sscripts.
- D 2015-10-30T14:25:57.043
 -C Return\simmediately\sif\ssqlite3PagerWrite()\sis\scalled\swhen\sthe\spager\sis\sin\sPAGER_ERROR\sstate.
 -D 2015-10-30T14:28:16.049
 -F Makefile.in 2ea961bc09e441874eb3d1bf7398e04feb24f3ee
++C Add\snew\sAPI\sfunction\ssqlite3_db_cacheflush().
++D 2015-10-30T16:14:03.663
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  F README.md 8ecc12493ff9f820cdea6520a9016001cb2e59b7
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diff --cc manifest.uuid
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--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
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