Edits to research-usage section

- "datatype" -> "data-type" (for consistency with other parts of the paper)
- "file formation" -> "file format"
- Reword description of crack-data extraction
- Add double back-ticks around ``measure.profile_line``
Add missing word ('mask')

Also, format lines so it's easier to pick out the diff from master
Merge pull request #46 from tonysyu/edits/usage-research

Edits to research-usage section