more compact Markup.markup_report: message body may consist of multiple elements;

reject internal term names outright, and complete consts instead; more general Name_Space.check_reports; more compact Markup.markup_report;

eliminated odd type constraint for read_const (see also 79c1d2bbe5a9);

more uniform check_const/read_const;

tuned;

more rigid type_name demands, based on educated guesses about the tools involved here;

tuned signature -- more uniform check_type_name/read_type_name; proper reports for read_type_name (lost in 710bc66f432c);

clarified treatment of consts -- prefer value-oriented reports;

clarified check of internal names;

tuned signature;

tuned;

tuned

renamed 'fun_rel' to 'rel_fun'

renamed 'prod_rel' to 'rel_prod'

renamed 'sum_rel' to 'rel_sum'

renamed 'filter_rel' to 'rel_filter'

renamed 'endofun_rel' to 'rel_endofun'

renamed 'vset_rel' to 'rel_vset'

fixed NEWS

renamed 'set_rel' to 'rel_set'

tuned

rationalized imports

move special BNFs used for composition only to BNF_Comp; use local copy of identity function that gets unfolded later for ID

renamed 'cset_rel' to 'rel_cset'

renamed 'fset_rel' to 'rel_fset'

renamed 'map_pair' to 'map_prod'

renamed 'map_sum' to 'sum_map'

more careful simplification of sets (cf. abf91ebd0820)---yields smaller terms

remove lemmas in favor of more general ones: convex(_hull)_set_{plus,setsum}

generalize lemma closure_sum

generalize lemmas

more symbols;