199.28

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

The exp-tagged code in CVS for MzScheme and MrEd is now version 199.28.

The changes are small, mostly just bug fixes:

 * Changed `assf' in MzLib's "list.ss" to apply its first argument to
   the car of each list element, instead of directly to each list
   element. The new behavior seems like a more natural generalization
   of `assq'.

 * Added a `current-load/use-compiled' parameter.

 * Unix: fixed `subprocess' handling of execute failures.

 * Fixed performance problems with `equal?' and `equal?'-based hashing
   on (transparent) structures.

 * Fixed clickbacks to distinguish them while tracking clicks (PR
   2133).

 * Miscellaneous minor bug fixes, many of which were actually
   exp-tagged between the 199.27 and 199.28 designations.

Matthew