deprecate arithmetic operators for ranges; eliminate use in Octave * Range.h, Range.cc: Deprecate unary -, binary +, -, *, and / operators for Range objects. (Range::m_cache): Delete mutable data member. Remove all uses. (Range::clear_cache): Delete function and all uses. * op-range.cc: Eliminate special arithmetic operators for ranges. All computations will now be performed as arrays. Eliminate special concatenation functions.

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