* fixed bug 62: constraints were not propagated into a loop.
* fixed bug in embedded calls of SORT (reported and investigated by
Wolfgang Jenkner).
+ * fixed some bugs revealed by Paul Dietz' test suite:
+ ** printing and reading of arrays with some dimensions having
+ length 0 (thanks to Gerd Moellmann);
+ ** BOA constructor with &AUX argument without a default value does
+ not cause a type error;
+ ** CONSTANTP now returns true for all self-evaluating objects.
planned incompatible changes in 0.7.x:
* (not done yet, but planned:) When the profiling interface settles