fix some problems in ipmag.upload_magic3, including not-dropping all non-MagIC columns.  instead, drop all known nuisance columns and warn about all others (addresses #119)
fix some problems in ipmag.upload_magic3, including not-dropping all non-MagIC columns.  instead, drop all known nuisance columns and warn about all others (addresses #119)
lfairchild/PmagPy,lfairchild/PmagPy,lfairchild/PmagPy