Remove hard-coded key for availability graph.

Hard-coding `avgresponse` as the key for an availability graph caused the graphs for both tables to display the same data.
Removing it allows the graph's `valueAttr` property to define the data displayed.
Move hide-show instantiation until after the table has been initialised.

It was initialising with a table that didn't exist yet.
Return rows of journeycollection as table columns

Remove now defunct getDataByTableRows method.
Filter columns of availability module tables

Do not render data for columns with defined keys that are not the valueAttr for the table.
Removed now-defunct getDataByTableRows method.
Remove redundant getDataByTableFormat methods from collections.

This is all handled by `getTableRows` now.
Fix label and key that got swapped in refactor
Fix config for SORN grouped-timeseries graph
Fix grouped-timeseries config for tax disc and vehicle licensing