Merge the ability to plan virtual table queries using overloaded functions.

FossilOrigin-Name: 2c2a202c14fa8803fb1e4b7356cbc9cd49e65a27e19bf6e3fd0e9dff9d5c67f9

diff --cc manifest
index ead659468da7c3deb1dd62c70f03f18acb82743a,b86958ab3efd929917878ee6895f491c214d30b9..697e8ec3e0de3697e5086ae6204ef22bb1d3c8af
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,10 -1,10 +1,10 @@@
- C Minor\scorrection.
- D 2018-05-26T12:21:21.540
 -C Experimental\schange\sthat\sallows\soverloaded\sfunctions\sto\sbe\sanalyzed\sby\nthe\sxBestIndex\smethod\sand\sused\sby\sthe\sxFilter\smethod\sof\sa\svirtual\stable.
 -D 2018-05-26T18:03:48.120
++C Merge\sthe\sability\sto\splan\svirtual\stable\squeries\susing\soverloaded\sfunctions.
++D 2018-05-26T20:04:20.602
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 -F Makefile.in bfc40f350586923e0419d2ea4b559c37ec10ee4b6e210e08c14401f8e340f0da
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 +F Makefile.msc 550559948ff2bfccff07186842fcae6c25ec93468f42bace545761543f07c25d
  F README.md 7764d56778d567913ef11c82da9ab94aefa0826f7c243351e4e2d7adaef6f373
  F VERSION b7c9d1d11cb70ef8e90cfcf3c944aa58a9f801cc2ad487eebb0a110c16dfc2df
  F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
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diff --cc manifest.uuid
index c1b230bdb5bf5333d8ce371040f582c36fb9a461,bf9a43fb0df6789721274e3ed5dede1ea690bd48..7ce57aa5c81f531f39ccf1171729dde6a5f8a152
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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