* query: add --warn-exceptions, dateparser, docs
added --warn-exceptions (like --raise-exceptions/--drop-exceptions, but
lets you pass a warn_func if you want to customize how the exceptions are
handled. By default this creates a logger in main and logs the exception
added dateparser as a fallback if its installed (it's not a strong dependency, but
I mentioned in the docs that it's useful for parsing dates/times)
added docs for query, and a few examples
--output gpx respects the --{drop,warn,raise}--exceptions flags, have
an example of that in the docs as well
fix fairly uncontroversial stuff in my.core like
- line spacing, which isn't too annoying (e.g. unlike many inline whitespace checks that break vertical formatting)
- unused imports/variables
- too broad except
- restructure query code for cli, some test fixes
- initial query_range implementation
refactored functions in query some more
to allow re-use in range_range, select()
pretty much just calls out to a bunch
of handlers now
