1682 Type promotion and operator mapping #1734
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Fix #1682
Moves the relevant parts of the operator mapping table into the sections for Arithmetic Expressions and Value Comparisons. Adds links to the op: functions in F&O.
Drops the Type Promotion appendix, moving the rules inline; and drops the term "type promotion"
Adjusts the specs for sum() and avg() so they are now defined directly in terms of pairwise addition of values.