Fix a problem with SQLITE_OMIT_WAL builds.
Fix a problem with SQLITE_OMIT_WSD builds.
Add the .fullschema command to the sqlite3.exe utility.  This command shows
the schema and the content of the sqlite_stat tables, all in one go.  Useful
when reporting problems with the query planner.
Add the showstat4.exe utility program for decoding and displaying the 
content of the sqlite_stat4 table in a database.