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Parents and children of check-in [4c782c95]

Fix crash in sqlite3_vtab_collation() when called for an IS NOT NULL constraint. (check-in: ad38d2c4 user: dan tags: trunk)
Experimentally add the SQLite expert functionality to the shell tool. (Closed-Leaf check-in: 51068dba user: dan tags: expert-in-shell)
Add an experimental location(X) SQL function that attempt to return the location of the payload within the database for the record that contains column X. location(X) returns NULL if X is not an ordinary table column or if SQLite cannot figure out the location because it is using a covering index. (check-in: 51be9558 user: drh tags: location-function)
Add the sqlite3_vtab_collation() function, which allows an xBestIndex callback to determine the collation sequence that SQLite will use for a comparison. And the SQLITE_DBCONFIG_FULL_EQP configuration option, which enhances the output of "EXPLAIN QUERY PLAN" so that it includes statements run by triggers. And the code for the sqlite3_expert extension and command line application. (check-in: 4c782c95 user: dan tags: trunk)
Merge latest trunk changes into this branch. (Closed-Leaf check-in: d5b597b5 user: dan tags: schemalint)
Add unnecessary initializations to some local variables in the rtree module to suppress false-positive compiler warnings coming out of MSVC. (check-in: 64487d65 user: drh tags: trunk)