update documentation: print mode "latex" only affects syntax tables, but output of symbols;

misc tuning and clarification;

clarified section structure;

tuned;

tuned;

tuned;

tuned signature;

clarified symbolic output: avoid redundant "block" element for open_block = true;

clarified signature;

clarified (again): Markup.intensify is already part of Variable.markup_fixed for undeclared variable, Markup.fixed is already part of Mariable.markup;

more accurate Symbol.length;

tuned;

merged

more inner-syntax markup;

obsolete (see a8502d492dde);

minor performance tuning;

tuned proofs; tuned whitespace;

more inner-syntax markup;

merged

time_fun: lambdas and lets work now

variable instantiation in Sledgehammer and Metis

prefer rewrite_term_yoyo for improved performance and occasionally better results (conforming to Ast.normalize);

revert b35c2aa05fcf: redundant due to 89ea66c2045b, if object-logic judgment lacks delimiters;

clarified position constraints: omit redundant information, e.g. for implicit object-logic judgment;

unused (see 0199acc01aa8);

tuned;

more robust: avoid ambiguity of contract_abbrevs;

misc tuning: more concise (or hermetic) pointfree style;

provide rewrite_term_yoyo, which is analogous to Ast.normalize;

tuned signature;