Closed #333.

 * Refactor the internal representation of SQL expressions so that they
   use less memory on embedded platforms.
 * Reduce the amount of stack space used
 * Fix an 64-bit alignment bug on HP/UX and Sparc
 * The sqlite3_create_function() family of interfaces now return
   SQLITE_MISUSE instead of SQLITE_ERROR when passed invalid parameter
   combinations.
 * When new tables are created using CREATE TABLE ... AS SELECT ... the
   datatype of the columns is the simplified SQLite datatype (TEXT, INT,
   REAL, NUMERIC, or BLOB) instead of a copy of the original datatype
   from the source table.
 * Resolve race conditions when checking for a hot rollback journal.
 * The sqlite3_shutdown() interface frees all mutexes under windows.
 * Enhanced robustness against corrupt database files
 * Continuing improvements to the test suite and fixes to obscure bugs
   and inconsistencies that the test suite improvements are uncovering.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>