[Changeset] Compatibility fix for assert

[David Bateman]

Matlab's assert function doesn't have the same syntax as Octave. There
is an overlap in that assert(cond) is the same. However, matlab doesn't
accept the expected value or tolerance arguments but instead accepts an
error message, msgid and additional arguments to print.

If we assume that if the first argument is logical and the second a
string, then we have a matlab compatible use of assert it is easy to add
this feature, and the attached changeset does this. We might even
enlarge the case to have isnumeric(cond) and second arg is a string be
accepted, but in that case assert(3,"dog") will change its behavior.

Regards
David
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