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add an Isar proof found with Sledgehammer that involves a Skolem constant (internally)

reintroduced short names for HOL->FOL constants; other parts of the code rely on these

save the name of Skolemized variables in Sledgehammer for use in the proof reconstruction code

unskolemize formulas in proof reconstruction + detect newer SPASS versions to avoid truncating identifiers if not necessary (truncating confuses proof reconstruction)

redo Sledgehammer proofs (and get rid of "neg_clausify")

removed "sorts" option, continued

remove Sledgehammer's "sorts" option to annotate variables with sorts in proof;
what we need is smarter type annotations for variables _and_ constants

insert a nice proof found by Vampire, which demonstrates the use of "let" in Isar proofs

support Vampire definitions of constants as "let" constructs in Isar proofs

tuning