* Another big chunk of v4-require-isms
* Allow `#lang framework/keybinding-lang' for keybinding files
* Move hierlist sources into "mrlib/hierlist", leave stub behind
svn: r10689
* docs build into user-specific directory so they're not a problem
with not including this in the distribution.
* misc doc improvements
* renamed handin-server.ss to main.ss
* basic operation is fine with v4
svn: r8716
