Can't turn temp_fixed values to False

[BethanyRS]

Making a string greater than four characters (such as 'False') in the temp_fixed column of the ipac table results in the error "StringTruncateWarning: truncated right side string(s) longer than 4 character(s) during assignment". This seems to be a documented issue with astropy tables. However, it should be corrected for users wishing to unfix the blackbody temperatures with code.