Add import checks

[mjpost]

Ingestion is currently a largely manually and therefore error-prone process. It would be very helpful to have scripts that checked for various common problems. Some of these could include:

• Extract the title from a PDF and ensure it lines up with the metadata in order to avoid problems like this one.
• Look for instances of missing LaTeX-protected capitalization
• Ensure the abstract is present
• Look for LaTeX artifacts
• Look for PDF cut-and-paste artifacts in the abstract (e.g., hyphenation)
• Look for names that are all lowercase (usually a mistake)
• (Many others)

[davidweichiang]

I'm not sure if this belongs under #136 or here, but I managed to do a readable diff of the Anthology XML against the BibTeX files. (TIL about Python's excellent difflib module.)

Main takeaways:

• Most changes look right
• There are some issues with author names
• There are some places, but not that many, where some information has been lost
• There are plenty of places where fixed-case marking has been lost
• There are a number of files where the BibTeX reader died, so the diff couldn't be done

[davidweichiang]

Copying some frequent issues from the now-closed PR #140 so they don't get lost. These are nasty bugs in the current bib->xml conversion that need to be fixed.

• \te incorrectly maps to ẹ (e with underdot). This happens even when \te is not followed by space, so \textit gets mapped to ẹxtit.
• Strings like Author{1}{Affiliation} creep into the abstracts, starting around 2017.
• Many acute accents were incorrectly changed to graves, over e, i, and A.

Here's an especially ironic instance of the last issue: From pecher to pêcher... or pècher: Simplifying French Input by Accent Prediction

[danielgildea]

* `\te` incorrectly maps to `ẹ` (e with underdot). This happens even when `\te` is not followed by space, so `\textit` gets mapped to `ẹxtit`.

This was fixed by commit [4744520]

* Strings like `Author{1}{Affiliation}` creep into the abstracts, starting around 2017.

Not sure how this is happens - these are in the bibtex files before conversion to xml.

* Many acute accents were incorrectly changed to graves, over `e`, `i`, and `A`.

The problem with A is fixed by the commit above. The problem with e and i I have not been able to reproduce.