#129 ISEQ does not throw error on non-integer inputs

[David Costanzo]

ISEQ is defined to create a sequence of integers.
That's what the "I" stands for (as opposed to RSEQ,
which creates sequences of rational numbers).

However, ISEQ does not throw an error when given a
non-integer number. Instead it outputs a sequence of
rational numbers, which is not what it is documented to do.

This should be fixed. ISEQ should throw an error on
non-integer input. Unfortunately, there is no NUMBERP
or INTEGERP predicate, but one could be simulated with
INT and EQUALP.

[David Costanzo]

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I have checked in a fix for this. It will be available in
FMSLogo 6.10.0.