Hi, I'd like to hear your opinion on pantable's dependencies.

For now, pantable only depends on panflute (and else all in Python's 
standard library). But there's a few things I want to do that would be 
impossible without further dependencies. Notable ones are matplotlib, 
numpy, scipy, matplotlib2tikz, pandas. And you can see these are related to 
plots and/or CSV readers/writers. Other potential dependencies would be 
xlsx reader/writer, etc.

Some of the dependencies are quite big and I'm not certain if they'll build 
successfully on alternative architecture. So I think I either list all 
these into the dependencies and make all pantable users also install them, 
or I make them optional dependencies, where some functions will only 
function if those are installed (with error hinting which to install). 
While the later approach seems best to have minimal impact on the others, 
the former approach is more "all-inclusive", and will be easier to maintain 
for example for which CSV reader/writer to use (I'd want to use pandas' but 
if pandas is optional then I need to deal with 2 different implementations 
leading to potentially different behaviors.

Thanks.

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