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* Extend the optimizations for equalities This commit supplements the optimisations of equalities in conjunctions and disjunctions: * for conjunctions, the existing optimizations with ranges are extended with not-equalities and inequalities; these lead to a fast resolution, the conjunction either being evaluate to a FALSE, or the non-equality conditions being dropped as superfluous; * optimisations for disjunctions are added to be applied against ranges, inequalities and not-equalities; these lead to disjunction either becoming TRUE or the equality being dropped, either as superfluous or merged into a range/inequality. * Adress review notes * Fix the bug around wrongly optimizing 'a=2 OR a!=?', which only yields TRUE for same values in equality and inequality. * Var renamings, code style adjustments, comments corrections. * Address further review comments. Extend optim. - fix a few code comments; - extend the Equals OR NotEquals optimitsation (a=2 OR a!=5 -> a!=5); - extend the Equals OR Range optimisation on limits equality (a=2 OR 2<=a<5 -> 2<=a<5); - in case an equality is being removed in a conjunction, the rest of possible optimisations to test is now skipped. * rename one var for better legiblity - s/rmEqual/removeEquals (cherry picked from commit 62e7c6a010f10cd7893ee5c99bad8b8d2a693436)