lc field_filters on user registration validation

added authentication function using D2::Plugin::Auth::Extensible; new admin function to register new user; removed GET /login route - using auto_page()

fix for 'mysql server has gone away' message - new DB check_db_connection() method clears dbix object if no ping received from db, forcing dbix object recreation; wrapped 'horrible' deferred keyword in flash() method; dev logger uses Console::Colored output

modified HTML::FormHandler validation class to return same data structure as Data::FormValidator class

switched model & app validation classes - DFV currently more suitable for model than HTML::FormHandler: eg manipulating validation profile required fields in model instead of template

separated Reporter::Validation class into RV::SearchForm & RV::ReportForm to isolate profiles; handles failure to find request from search form; ajax find diagnosis function required info key (ICDO3) to be not undef; hide some page elements in print view

replaced HTTP::Validate with Data::Formvalidator in Reporter::Validator; retrieval of request data includes previous report if submitted by same user otherwise new draft report created; request data saved in session for template in case db update/insert fails and original data needs to be re-displayed; changed validation from HTML::FormHandler to Data::FormValidator, pending ability to select validation profiles; app now fully functional

moved sql query construction to new Reporter::SQL::Library class using Local::QueryLibrary & SQL::Abstract::More