Added several distribution targets.  Most need further testing, but they largely seem to work.
Added several distribution targets.  Most need further testing, but
they largely seem to work.

New features:
- grab version number from build.properties.
- automatically generate JLVersion.java from the version number
- build distributions from a fresh cvs checkout
- polyglot.jar includes a manifest that allows polyglot to be run with just:

    java -jar lib/polyglot.jar <file.jl>

  (assuming java_cup.jar is in lib)

Need to add:
- targets to run regression tests

xcv58/polyglot,liujed/polyglot-eclipse,xcv58/polyglot,blue-systems-group/project.maybe.polyglot,liujed/polyglot-eclipse,blue-systems-group/project.maybe.polyglot,liujed/polyglot-eclipse,liujed/polyglot-eclipse,blue-systems-group/project.maybe.polyglot,xcv58/polyglot,blue-systems-group/project.maybe.polyglot,xcv58/polyglot