register_and_error_log.pl converted to use tt for message

fixed Dispatch error_document - was passed in args_to_new by mistake; added 500.html error document for Apache; added new 500 error test to Resources/Test

enabled request options (urgent, private & copy_to) in search function; moved Devel::Cycle function from LIMS to L::Local::DevelCycle

replaced several calls to L::Local::find_home() with call to config instance; removed call to L::Local::Debug from lims_config.pl, as debug() uses config instance, which uses lims_config.pl; model classes get config from config instance instead of constructor passing it in LIMS::model(); general tidy-up

replaced multiple calls to load config settings with LIMS:Local::Config->instance(), using Class::Singleton to ensure config file opened & read only once at server startup

hilis3 conversion scripts for YHHN