Add ".. -*- coding: utf-8-with-signature -*-" to the first line of each .rst
file. This tells emacs to treat the file contents as utf-8, and also to prepend
a so-called utf-8 "bom" marker at the beginning of the file. This patch also
prepends those markers to each of those files.
Remove install.html (long since deprecated).
Also replace some obsolete references to install.html with references to quickstart.rst.
Fix some broken internal references within docs/historical/historical_known_issues.txt.
Thanks to Ravi Pinjala and Patrick McDonald.
refs #1227