remove transformations in /repo request
consolidate pull and file_diff python code
Discard Comment link
add "Reply" functionality
Implement "Done" and "Acknowledged" links
Change "user" to "owner" where appropriate.
remove some dead code
reorganize: move file list above diff
Hide intra-line diffs if they're too noisy
Make sha pair sticky on /pull pages; eliminate /diff XHR
consolidate more pull and file_diff code
bug fix; get more terse