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Fix a typo in a comment

Add more tests for REPEAT
- REPEAT accepts the name of a procedure in place of the instruction list
- REPEAT can convert a word into a number.

Add a new function nonnegative_fixnum_arg to replace nonnegative_int_arg.
Update the implementation of ARRAY to use this new function.
Also, give better names to the local variables in larray().

The new function accepts the argument itself, not the argument list.
It therefore does not modify the argument list as a side effect.
This is part of a larger effort to make the code base simpler by reducing the number of side effects.

Only run the RUNOUTOFMEMORYTEST tests on Windows.
On GNU/Linux these work, although I haven't investigated why.

Add tests that bad input errors for ARRAY are recoverable.

Remove SETITEMTEST from ARRAYTEST in array.lgo.
SETITEM is now tested (more thoroughly) in setitem.lgo.

Replace RUNBADINPUTTEST with RUNNONRECOVERABLEDOESNTLIKEINPUTTEST in APPLYTEST.BADINPUT.
This additionally tests the error code and the error message.

Add more tests for REPEAT, particularly that bad input errors are recoverable.

Add a comment to explain why graphics.h must still be included.

Stop including graphics.h, since it's no longer needed.