Create a new src/priv/ directory for private algorithms.

* README: Document it.
* configure.ac: Generate src/priv/Makefile.
* src/Makefile.am: Recurse into priv/.
* src/priv/Makefile.am: New file.
* src/misc/acccompl.cc, src/misc/acccompl.hh,
src/misc/accconv.cc, src/misc/accconv.hh: Move to...
* src/priv/acccompl.cc, src/priv/acccompl.hh,
src/priv/accconv.cc, src/priv/accconv.hh: ... here.
* src/misc/Makefile.am: Adjust.
* src/tgbaalgos/scc.cc, src/tgbaalgos/simulation.cc: Adjust
includes.
* src/sanity/style.test: Make sure no public header
file include a private one.

configure.ac

@@ -161,6 +161,7 @@ AC_CONFIG_FILES([
   src/Makefile
   src/misc/Makefile
   src/neverparse/Makefile
+  src/priv/Makefile
   src/sanity/Makefile
   src/saba/Makefile
   src/sabaalgos/Makefile