Guide data and selections aren't aged equally

[Arisian]

SER data (programmes) and Selections (reminder-alarm) use different values to delete old records.

[Arisian (mmclagan)]

The following consolidates the aging of history into a single place. It does not have a UI to set the value, but it is stored in the configuration.

What I don't like about this is it should *probably* use the start of day time from the configuration rather than days from "now" to age the records but I followed the code as it was.

[Andy Balaam (mail-artificialworlds)]

Thank you. I will take a look as soon as I get a chance.

[Arisian (mmclagan)]

I guess it would help if I added the *RIGHT* patch...

[Andy Balaam (mail-artificialworlds)]

This patch looks very good - I've attached a version that applies cleanly to the latest code.

I don't want to commit it until I've got some tests for it, though. It should be possible to make file/selection deletions happen in a virtual method and then in the test make a subclass that implements that method to keep track of what would have happened, and confirm that it works as expected.