Add support for two sets of footnotes (alphabetical and numbered).

[calcnerd256]

Description

This PR adds two new commands: \EOAfnalph and \EOAfnarabic to allow for two distinct sets of footnotes to be added to a document, one numbered and one alpha-numbered (aa,ab,ac...). These commands are defined to be incompatible with the existing \EOAfn command and using both in the same document will produce an error.

No changes to EOADjango are required to import the xml produced from using these commands because we're outputing XML that is compatible with the existing footnote import.

We're introducing the following new package dependencies, all of which are included inside the TeX Live distribution

• bigfoot - extends what LaTeX can do with footnotes
• etex - support for modern LaTeX features
• alphalph - convert numbers to letters for alpha-numbered footnotes past 26

Motivation and Context

Provides feature specified in issue #4

Screenshots

epub

PDF

Django

[calcnerd256]

Hey, @lmc . Looking at these screenshots, it seems we don't adequately support \EOAciteauthoryear inside the footnotes in our Django and epub output in the same way that the PDF output does. I'm not sure whether we introduced the changes that broke this or if they are present in the master branch. I would suggest hat we try to reproduce the undesired behavior in master before merging potentially breaking changes from this branch. So let's grab a copy of master and try to generate the offending screenshots from within it.

[calcnerd256]

It looks like, even in the old version, nesting an \EOAciteauthoryear inside an \EOAfn looks different in the PDF than it does in the Django and epub outputs.

Therefore, I feel confident that merging this branch will not introduce this bug. Either the bug already exists in master or it won't exist after the merge.