Further ideas on user authentication.  Not yet working code.
Add the ".user" shell command and implement the sqlite3_user_add()
routine.  Incremental check-in.  The code compiles but does not work.
Complete the implementation of the various APIs.  Fix several problems.
This is another incremental check-in that does not completely work.
Reorder parameters on the sqlite3_user_*() interfaces for consistency.
Add the first TCL test cases.