Add support for expense accounts

[chevdor]

It would be nice to be able to:

• list expense accounts
• delete a given expense account

It would provide a nice workaround to this issue.

[afonsoc12]

Hi,
It's an interesting use case!

I think those are two separate issues:

• list accounts and ability to edit/delete a single account (basically manage it)
• Ability to run "tasks", one of which is delete all unused accounts (and in the future other useful tasks)

I can start thinking about the latter first.

I'll report back with some news

[chevdor]

My initial issue was less about tasks and the reason is that, if you have the first features, the rest can be done via script/cron.
I also came to realize that unused expense accounts should not be created in the first place and FF rules can help with that.
However, a periodical cleanup would indeed be useful.