Lakshmi

Changed
- `lak` commands now don't print stack trace by default. Added a flag `--debug`
to enable printing of the stack trace.

Added
- Added functionality in `lak list lots` to optionally print account names
and terms for the tax lots.

Changed
- `lak analyze allocate' now supports asset classes with zero desired ratio.
Thanks [rapidleft](https://github.com/rapidleft).

Added
- Added functionality in the `cache` module to prefetch multiple cached objects
in parallel threads.
- Added prefetch method in assets that calls the newly added functionality
in the `cache` module. Also, added a prefetch method to portfolio that
prefetches the prices/names for all the assets in the portfolio in parallel.

Changed
- lak command that access the whole portfolio now uses prefetch to
speed up refreshing the prices of the portfolio by using multiple threads to
do so.

Added
- A new command `lak analyze allocate` which suggests how to allocate new cash,
while making sure the actual asset allocation remains close to the desired
allocation. This command can also be used to get rebalancing suggestions or to
withdraw money from the portfolio. In all cases, it will suggest changes that
will minimize the relative difference between actual asset allocation and the
desired asset allocation.
- A new
[recipes doc](https://github.com/sarvjeets/lakshmi/blob/develop/docs/recipes.md)
documenting tips and tricks for using Lakshmi.

Changed
- Changed some of the common methods to return percentages rounded to 1 digit
rather than 0.
- Earlier asset classes with no money mapped to them were not returned when
returning asset allocation. Now all asset classes are returned regardless of
whether they have money mapped or not.

Fixed
- Relaxed Python requirement to 3.7.

Added
- A new command `lak list accounts` that allows printing account values and
percentages by accounts or by account types.
Fixed
- The spinner chars were not showing properly on MS Windows 11. Changed to
a simpler spinner.