(feature request) Implement filtering on the Posting Journal and General Ledger

[jniles]

We currently only support inline filters on the Posting Journal and General Ledger. These work for small data sets, but will run into performance problems on larger data sets (like the General Ledger).

I propose that we build filtering into the Invoice Registry's filter form, for the time being. See below:

Fig 1: Invoice Registry Filter Form

We can later look into more complex filtering (#300).

The behavior should be roughly the same as the registry pages:

1. Filters are cached in the browser so that a page refresh does not clear them
2. Filters are displayed in a bar at the top of the grid (bhFiltersApplied directive).
3. Filters can be canceled one by one or all at once.
4. Ever visible column (or potentially visible) should be able to have some kind of filter applied.