Define chained operators, for ease of entering expressions like 1 < 2 < 3.
This module defines three extra variations of each of the operators
==, for use at the beginning, middle, and end of such chains.
These operators have dots on the inside of the chain, for instance:
x <. y .< z 1 <. 2 .<. 3 .<=. 3 .< 4 square (0,0) ==. square (0,1) .== square (0,2)
These operators are defined to be left-associative and the same precedence as the ordinary comparison operators.
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