* Provide dedicated formatting for more Beancount types.
* Improve code to determine when we're looking up link metadata
and should format output as links.
query-report was heading to a place where it was going to bifurcate. You
could structure input with its own special input switches, and with ODS
output, it would have its own dedicated grouping logic and use that.
But those things shouldn't be tied together for users. Instead, add
functions to BQL to be able to do the kind of grouping we want. This commit
adds those. Next we'll extend the ODS output to detect and format these
groups correctly.
This provides more flexibility in repository setup while remaining backwards
compatible.
The changes to test_reports_query are just to accommodate the new
transaction in 2020-expenses.beancount.
Ultimately this is going to be a tool that can generate nicely-formatted
spreadsheets from arbitrary bean-queries. This initial version doesn't
generate spreadsheets yet, but it does integrate our usual books-loading
tools and rewrite rules into existing bean-query functionality, so it's a
start. It also has some of the query building and parsing that higher-level
spreadsheets will need.
