Csvkitcat

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Likely the last update as "csvkitcat" before moving to csvmedkit

- csvwhere

- csvsed, csvrgrep
- revamped required arguments and additional expressions

- csvsed

+ --like-grep now only filters by the first (required) expression, as chaining additional expressions likely results in a too-small result set for most use cases


- csvchart: killed, moved to csvviz library

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- changed various flags for many of the tools
- added ``--version`` flag
- cleaned up internals and csvkit inheritance
- [NOT YET FIXED] csvsed is fixed

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- :doc:`csvrgrep <moreutils/csvrgrep>`: like ``csvgrep``, but designed for when you want to concisely do a lot of regex filtering over a combination of columns

- csvsed: reworking its internals. Still being worked on, but current tests pass

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- the ``regex`` module seems to be very slow (e.g. csvsed), so it's been replaced with standard ``re`` in all tools except ``csvnorm``. Hopefully that's ok!

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:doc:`moreutils/csvgroupby`: for doing the equivalent of SQL ``GROUP BY [columns]``

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:doc:`csvpivot <moreutils/csvpivot>`: Pivot a table on rows and columns (TK better label)