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Answers below, but note you're using a very old version of Wireshark (1.8.10) which was EOL June 2014. See the Wiki LifeCycle page for more info.

1. That's the specified output of the -z diameter option, from the man page:

   -z diameter,avp[,cmd.code,field,field,...]

   ...

   Following fields will be printed out for each diameter message:

   "frame" Frame number.

   "time" Unix time of the frame arrival.`

2. When using -T fields, column names must be prefixed with _ws.col., e.g. _ws.col.Info.