moved mysql_backup.pl & national_code_unknown.pl scripts into mukti dir

removed all BEGIN blocks from cron scripts - need to load Data::Dumper's Carp from local::lib before system Carp gets any chance of loading

bugfix LL::ExcelHandler - no access to LIMS::error() method so replaced return with die; removed BEGIN block in sysmex.pl script - generates Carp version error in Deb7 perl version; changed directory permissions on sessions & src/data dirs to allow apache to read/write without requiring 777

new yearly register_and_error_log.pl