The DataFeed now knows what its query was...

...which means that it can be shown when and if the echo setting is on. The
feed also has the full (ie, modified by the .select, .where and .order
options) query as well.
The echo command line option is being recognised and respected. Formatters
might want to have a look at the query so that, say, HTML related variants
can process the SQL how they see fit.
Getopt is out, manually reading command line args is in.

By not collecting all the switches from the front of the line and only
processing commands from the back of the line, you can intermingle
switches, queries and radish internal commands on the command line.