Summary
- added 'mlex_iff' lemma and simplified proof
- merged
- recovered document from 9bfb6978eb80;
- NEWS;
- obsolete;
- tuned;
- ROOT cleanup: empty 'document_files' means there is no document;
- eliminated pointless warning (see a35af478aee4): empty 'document_files' means there is no document;
- more informative timeout message, notably for build_status;
- clarified: adapted to ML version;
- proper order of initialization (amending 9953ae603a23);
- More topological results overlooked last time
- merged
- New results in topology, mostly from HOL Light's moretop.ml
- generalized some lemmas on multisets
- rule out pathologic instances
- tuned some proofs and added some lemmas