updated tests to work with Test::WWW::Mech changes (eg text_contains works where has_tag_like fails)

MAJOR CHANGES: search form uses jQuery watermark instead of dd-mm-yyyy display - changed date-field validation to accommodate; moved do_new_lab_test() method out of M::Role::ScreenUpdate to new M::Role::LabTestUpdate to share function with auto-requesting tests at diagnosis/authorissation; changed 'teaching' field to radio button in report page and changed handling of report_option fields in M::Roles::ReportUpdate::do_additional_options() - all request_options were being cleared during report stage; added updated_at timestamp field in M::Roles::ReportUpdate::do_request_report() to any unchanged request_report object to trigger mail_report.pl on authorised cases - were being missed as updated_at col was not being modified

bugfixes to test suite

added ability to p.m. users in "who's logged in" page; modified M::Base::get_objects_with() to use same logic as M::Base::get_objects()

patched date validation to allow date fields day, month & year to carry prefix (dob_* or request_*); patched .t and .tt to submit correct param (eg dob_day instead of day)

hilis3 conversion scripts for YHHN