patched L::Mail::_sendmail() to add 'content-type' header in lowercase otherwise ignored; M::User::register_login() truncates HTTP_USER_AGENT to mex 255 chars; gallium_data.pl sends .dat file as well as .xls}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1600 4177bd82-f056-0410-812d-caef170e3fa0