Targets / goals

[barrucadu]

It would be good to be able to specify things like "I want to save £200/month as of October" and have those show up on the charts, as well as a targets page which has a concise list and summary of them all.

A target is probably something like this:

1. A date, and a set of accounts and desired balances (or ranges of desired balances)
2. A date range, and a set of accounts and desired deltas over a time period (or range of desired deltas).

The former would capture things like "I want to save £2500 by the end of the year", and the latter things like "I want to put aside £200/month".