Bug 15339: TestBuilder warnings (code)

Bug 15339: TestBuilder warnings (code)

Makes TestBuilder::build() alert the user when unreognized
parameters are passed, which happens when the user supplies
the column values directly, forgetting the 'value' hash.

This patch holds the code changes. Examples of the kind of
errors that it catches are in the tests (separate patch).

Sponsored-By: Halland County Library
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>