Even check_from and check_to can be configured not to
use the DB backend, the module requires a DB connection.
This make rather impossible/ugly to use this functions
in a non DB environment.
Solutions:
1) split the functions and move the non-DB part in URI
module.
2) make URI_DB to work also without a DB connection if
not required.
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As a fast solution to the problem, no. 2 fix was applied on
CVS. No. 1 fix is a more nicer solution, but implies more
changes into code which should be avoid befor release. But
it still is something nice to have for after the release.