Add "up", and "down"; delete "clear" and add an $Id$ line.
Add "up", and "down"; delete "clear" and add an $Id$ line.

git-svn-id: 88bbbf8f5798dc67c7e8670b837dd03176c2df4b@373 453b2852-3d18-0410-866e-d09c099698e4

gfowley/ruby-debug,ruby-debug/ruby-debug,ruby-debug/ruby-debug,gfowley/ruby-debug,gfowley/ruby-debug,ruby-debug/ruby-debug