v0.100114

          Include errstr from underlying db (frew)

          update bugtracker
Add lockstring method to ::Lock
use $lockstring as a name more pervasively
Add is_locked flag to ::Lock to make unlock idempotent

Conflicts:
	Changes
	t/basic.t
v0.100115

          Add lockstring method to ::Lock (frew)

          Add is_locked flag to ::Lock to make unlock idempotent (frew)
fix test for multiline error message
v0.100116

        - tweak test expectations to allow for multiline unique key error
          (seems to be found in older SQLite?)
fix tests on DBD::SQLite 1.42