Consider dropping pdfminer and use XPDF to extract text from PDF

# Short Description
pdfminer is both slow and has been the source of more than a few issues in the past. Xpdf is C code and os-specific but the pdftotext command may be just enough of what we need:
http://www.xpdfreader.com/download.html

It comes with pre-built command line tools for Linux, Windows and Mac

## Possible Labels
- new feature

## Select Category
- Enhancement [x]
- Add License/Copyright []
- Scan Feature []
- Packaging []
- Documentation []
- Expand Support []
- Other []