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6 check-ins using file Makefile.in version 28a2772c

Replace a call to sprintf() with sqlite3MPrintf() since on some embedded platforms, sprintf() is busted. Need to go through and do similar replacements elsewhere in the code. (CVS 2790) (check-in: 1b4f2d89 user: drh tags: trunk)
Disable the OR-clause optimization if it does not result in an index being used that would not have been used otherwise. In other words, do not convert OR clauses into an IN statement if it does not help the optimizer. (CVS 2789) (check-in: 7e7cfce0 user: drh tags: trunk)
Make sure left joins still work even when the OR clause optimization fires. Ticket #1537. (CVS 2788) (check-in: cbbeb9de user: drh tags: trunk)
Remove some vestiges of the old OS_TEST driver. (CVS 2787) (check-in: 008f676f user: drh tags: trunk)
Add an OS method for making copies of file descriptors. This fixes the crash tests. (CVS 2786) (check-in: 57a674fc user: drh tags: trunk)
Modify the OS layer so that I/O routines are called through a virtual function table. The os_test.c module has been replaced by test6.c. The crash tests are busted now and need to be fixed. (CVS 2785) (check-in: 1f69aec2 user: drh tags: trunk)