fix for delcode restore; setmath|delcode also accept numbers instead of table (consistent with getters) (HH)

tracker 970: no prev pointer for head and node.check_discretionaries for emergency fixes of messed up disc nodes (better patch)(HH)

\hyphenationbounds (more strict) ; better \shapemode ; app *_par access now in macros in eq h file (part of consistency cleanup) -- the missed ones (HH)

\hyphenationbounds (more strict) ; better \shapemode ; app *_par access now in macros in eq h file (part of consistency cleanup) -- better patches (HH)

\hyphenationbounds (more strict) ; better \shapemode ; app *_par access now in macros in eq h file (part of consistency cleanup) (HH)

fix for hangindent at lua end + reset of shapemode unless < 0 (HH). WARNING: manual doesn't compile.