oscript v2.0-pre5

yet another snapshot on the road to v2.0... this will probably be the last snapshot before the final release, as things are getting pretty close.

Compared to -pre1, this release has: better stack traces (that are now correct in all cases), better performance, and some improvements in the editor (fix indenting rules, and bookmarks), etc

See http://objectscript.sourceforge.net/?docs/release-notes.html