added comments to new source files

fixed problem with fact names

remove hack and generalize code slightly

simplified isar_qualifiers and qs merging

put shrink in own structure

put annotate in own structure

support assumptions as facts for preplaying

some minor improvements in shrink_proof

some support for ML runtime statistics;

prefer tight Markup.print_int/parse_int for property values;

clarified new identifier syntax: exclude \<^isup>, include subscripted prime (to allow imitating full identifier here);

eliminated slightly odd identifiers;

tuned syntax, potentially more robust;

smarter list layout;

repaired text following 491c5c81c2e8;

merged

introduce filter_lim as a generatlization of tendsto

merged

based countable topological basis on Countable_Set

qualified interpretation of sigma_algebra, to avoid name clashes

eliminated finite_set_sequence with countable set

support for sub-structured identifier syntax (inactive);

eliminated some improper identifiers;

add upper bounds for factorial and binomial; add equation for binomial using nat-division (both from AFP/Girth_Chromatic)

tuned signature; tuned;

more uniform Symbol.is_ascii_identifier in ML/Scala;

tuned;

clarified Symbol.scan_ascii_id; ATP: follow change from Symbol.scan_id to Symbol.scan_ascii_id, assuming that this was meant here, not fully symbolic Isabelle identifiers;

tuned;

convenience operations for table as set;