* iface/gspn/common.cc, iface/gspn/common.hh,
src/ltlast/atomic_prop.cc, src/ltlast/atomic_prop.hh,
src/ltlparse/fmterror.cc, src/ltlparse/public.hh,
src/ltlvisit/dotty.cc, src/ltlvisit/dotty.hh,
src/ltlvisit/dump.cc, src/ltlvisit/dump.hh,
src/ltlvisit/tostring.cc, src/ltlvisit/tostring.hh,
src/misc/escape.cc, src/misc/escape.hh, src/tgba/bdddict.cc,
src/tgba/bdddict.hh, src/tgba/bddprint.cc, src/tgba/bddprint.hh,
src/tgbaalgos/dotty.cc, src/tgbaalgos/dotty.hh,
src/tgbaalgos/lbtt.cc, src/tgbaalgos/lbtt.hh,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/neverclaim.hh,
src/tgbaalgos/save.cc, src/tgbaalgos/save.hh,
src/tgbaalgos/gtec/status.cc, src/tgbaalgos/gtec/status.hh,
src/tgbaparse/fmterror.cc, src/tgbaparse/public.hh: Include <iosfwd>
in headers, and prefer <ostream> in the body whenever possible.
* src/sanity/style.test, HACKING: Check and document this.
ad96e8fbad