Much ado about nothing:

Much ado about nothing:
 1) repeat tac end ==> repeat tac
 2) do n tac end   ==> do n tac
 3) "goal n" finally dropped (deprecated, semantics no longer clear)
 4) the AST (in grafiteAst) has been changed to better reflect the
    distinction between tactics (including h.o. tactics, i.e. tacticals),
    punctuational tinycals and non punctuation tinycals (i.e. skip, focus,
    unfocus)
 5) all tacticals are now running properly in every condition;
    but tacticals argument (i.e. tactics occurring in tacticals) are
    disambiguated eagerly and not lazily (to be changed)

WARNING: the code in proceduralTypes.ml has been commented out since I am
not able to figure out how to fix it properly