fixed IsaMakefile action for HOL-TPTP.
added sh_minimize and preplay_timeout options to Mirabelle's Sledgehammer action;
added Mirabelle action info in its log file; tuned;
added max_new_mono_instances, max_mono_iters, to Mirabelle-Sledgehammer; changed sh_minimize to avoid setting Mirabelle-level defaults;
added tptp parser;
added ml-yacc library sources;
split make_tptp_parser into two scripts, for parser and lib respectively;
made Mirabelle-SH's 'trivial' check optional;