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Generalized some lemmas in a backward compatible way.
Some strictly more general lemmas now have suffix `_dep`.
+ * Generalised {ffun A -> R} to handle dependent functions, and to be
+ structurally positive so it can be used in recursive inductive type
+ definitions. Minor backward incompatibilities: fgraph f is no longer
+ a field accessor, and no longer equal to val f as {ffun A -> R} is no
+ longer a subType; some instances of finfun, ffunE, ffunK may not unify
+ with a generic nondependent function type A -> ?R due to a bug in
+ Coq < 8.10.
+
24/04/2018 - compatibility with Coq 8.8 and several small fixes - version 1.7
* Added compatibility with Coq 8.8 and lost compatibility with