tuned comment;
moved local syntax to local_syntax.ML;
common naming (for abbrevs and thms);
transfer: merge consts;
tuned pretty_term';
added polymorphic -- special case of generalize;
added add_abbrevs(_i);
read/cert: expand_consts;
Arith = FOL +
classes arith < term
consts "0" :: "'a::arith" ("0")
"1" :: "'a::arith" ("1")
"+" :: "['a::arith,'a] => 'a" (infixl 60)
end