103.4

[Matthew Flatt <mflatt@cs.utah.edu>]

In the CVS repository, the exp-tagged MzScheme and MrEd code is now
version 103.4.

This version is mainly for GC:

 * Upgraded conservative gc to 6.0alpha4.

 * 2k: fixed memory bug in thread/continuation setup, and fixed bugs in
   bignum optimizations.

Other changes:

 * Changed text% so that later-installed clickbacks take precedence
   over earlier-installed clickbacks.

 * Fixed several problems with regions, especially arc regions.
   Documented the fact that regions created with the `subtract'
   method are not reliable for post-script-dc% use.

 * Removed ps-setup%'s get-options and set-options. (Weren't needed,
   since the command string can contain option flags.)

 * X: changed default preview command from "ghostview" to "gv".


Matthew