simplified match patterns, eliminated old dollar-sign patterns
added derivs to reductions; prep for jump-to and zoom-in
changed step-note to step-type
svn: r5316
original commit: 9330d96ad7d1b66b5c6d3e1310cc14298d2c7ed1
updated to change in expansion of lexical variables
many UI updates and tweaks
improved syntax properties panel
added expand-only and expand/hide
added rudimentary textual stepper
fixed PR 8395 by adding snipclass for hrule-snip
fixed PR 8431: reductions and block splicing
fixed PR 8433: handling unquote and macro hiding w/ errors in hidden terms
svn: r5120
original commit: 056683743d998145deb4b2e82fa8fc73507ed7e3