new missing_request_forms.pl; new ajax jquery_check_value() entry; added LIMS::Model::Roles::DBIxSimple to L::M::Base

added new function to require confirmation when reporting with outstanding test results; moved C::Report::_get_requested_tests() to C::Roles::ResultHandler; converted some template data objects to as_tree hashrefs to prevent db lookups when empty; fixed some tests to comply with new confirm_outstanding_results flag

changed trigger & procedures definitions; new t/triggers.t