psychassert(expression, …) - Replacement for Matlab 7 builtin assert().
This is hopefully useful for older Matlab installations and
for the Octave port:

If the assert-function is supported as builtin function on
your Matlab installation, this function will call the builtin
“real” assert function. Read the “help assert” for usage info.

If your Matlab lacks a assert-function, this function
will try to emulate the real assert function. The only known limitation
of our own assert wrt. Matlabs assert is that it can’t handle the MSG_ID
parameter as 2nd argument. Passing only message strings or message
formatting strings + variable number of arguments should work.

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