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7 check-ins related to "stat4-without-rowid"

Fix for ticket [b2fa5424e6fcb15]: Better define the format of the sqlite_stat4 file for WITHOUT ROWID tables and make sure the ANALYZE command generates a file in the appropriate format. Use the sqlite_stat4 data to enable the use of WHERE terms that cover all indexed columns plus some prefix of columns in the primary key. (check-in: bc2de8095f user: drh tags: trunk)
Fix a problem in where.c with using the stat4 sample data of an index on a WITHOUT ROWID table. (Closed-Leaf check-in: 053a210e31 user: dan tags: stat4-without-rowid)
Fix the STAT4 information for WITHOUT ROWID tables. (check-in: 5d8628fdff user: drh tags: stat4-without-rowid)
Fix where.c so that the primary key values appended to every index entry on a WITHOUT ROWID table may be used when useful. (check-in: 6624a61d16 user: dan tags: stat4-without-rowid)
Omit non-primary-key columns from the STAT4 samples for WITHOUT ROWID tables. Indexes, both rowid and without-rowid, still hold an exact copy of the index entry. (check-in: de826c3158 user: drh tags: stat4-without-rowid)
Generate complete samples for sqlite_stat4 on WITHOUT ROWID tables. Ticket [b2fa5424e6fcb15b5] (check-in: 8cb43eddab user: drh tags: stat4-without-rowid)
Add makefile targets for various diagnostic tools, such as showstat4. Fix harmless compiler warnings in diagnostic tools. (check-in: 6f86d89b88 user: drh tags: trunk)