#12 Clean up analysis task agent

[Cinly Ooi]

It might be possible to create a generic "cleaner", a
cleaner that goes through the whole pipeline for each
of the datasets, and remove the output data as
indicated by the output ports.

Of course this means we need to introduce a toggle for
output ports to decide whether the output data should
be cleaned or not.

It should be linked to the "Pipeline Schemes" or other
mechanisms to allow users to clean up only the output
data they want to clean.