TO DO list for PercentFormat
============================
TO DO list for PercentFormat, more or less in order:
* when `%s` argument is char, generate `<char>` instead of `'<char>'`;
* when `%i`/`%f`/etc argument is a number encoded in a string, parse the number
and make it work;
* add `%e`;
* release percent-format package on Hackage;
* add link to Haddock documentation on README;
* add `%q` (see `tests/test-number.hs`);
* sweep `TODO`s scattered through files;
* *maybe*: make "%l" for lists:
> "%l" % [1,2,3] -- regular
[1,2,3]
> "% l" % [1,2,3] -- add spaces
[1, 2, 3]
> "%\nl" % [1,2,3] -- add linebreaks
[ 1
, 2
, 3 ]