/ Changes On Branch level-pseudocolumn

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Changes In Branch level-pseudocolumn Excluding Merge-Ins

This is equivalent to a diff from 7d9e22187d to c57deced09

Remove the undocumented requirement for applications that use an SQLITE_ENABLE_SQLLOG build to define a sqlite3_init_sqllog() function. (check-in: 5e43bf0132 user: dan tags: trunk)
Fix a couple comment typos and one overly long line. No functional changes. (Closed-Leaf check-in: c57deced09 user: mistachkin tags: level-pseudocolumn)
Add support for the LEVEL pseudo-column in the recursive part of a common table expression. LEVEL has the value of 1 on the first iteration and successively larger integer values of subsequent iterations. It cannot have a table qualifier. Actual columns named "level" can still be accessed by including the table name qualifier. (check-in: cc1cb32178 user: drh tags: level-pseudocolumn)
In where.c, do not allocate space in sqlite3_index_info structures for the internal WHERE clause "terms" generated to record column equivalencies. Fix for ticket [1a1a194d1e5f8]. (check-in: 7d9e22187d user: dan tags: trunk)
Handle a few obscure problems that could manifest if a database corrupted in a certain way was written by a connection in the middle of a SELECT statement on the same db. (check-in: eba8a564e6 user: dan tags: trunk)

Changes to addopcodes.awk.

Changes to src/expr.c.

Changes to src/resolve.c.

Changes to src/select.c.

Changes to src/sqliteInt.h.

Added test/with3.test.