Implemented WHEN, UNLESS, TRACE and UNTRACE.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2014-10-10 02:19:57
Author local date 2014-10-10 04:19:57 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2014-10-10 02:20:48
Committer local date 2014-10-10 04:20:48 +0200
Commit 1ed06dad68810a5501011a8ff1cf2bf5ca453ab9
Tree c767237cd633d67bebe9eb741c6918b1fb936c5a
Parent 36bb9c5408c7220f222f3ef1b5d6631bd9fa1da6
Implemented WHEN, UNLESS, TRACE and UNTRACE.
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