(calcAlg-edit, calcAlg-enter): Remove reference to calc-previous-alg-entry.
(calcAlg-previous): Use previous-history-element instead of calc-previous-alg-entry. (calc-do-alg-entry): Add history to reading from minibuffer. Change keybinding for calcAlg-plus-minus, add keybindings for previous-history-element and next-history-element. (calc-alg-entry-history, calc-quick-calc-history): New variables. (calc-do-quick-calc): Use calc-quick-calc-history. Remove reference to calc-previous-alg-entry. (calc-alg-entry): Use calc-alg-entry-history.
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