Downcase a couple of misnamed class names.

* src/misc/acccompl.hh, src/misc/acccompl.cc (AccCompl): Rename to
acc_compl.
* src/tgbaalgos/simulation.cc (AccComplAutomaton, Simulation): Rename
to acc_compl_automaton and direct_simulation.  At the same time,
reindent the whole file.
* src/sanity/style.test: Detect capitalized class names.
* src/kripke/kripkeexplicit.hh (KripkePrint): Remove useless
predeclaration.
* src/tgbaalgos/simulation.hh: Typo in comment.

src/sanity/style.test

@@ -67,6 +67,9 @@ for dir in "${INCDIR-..}" "${INCDIR-..}"/../iface; do
     case $file in
     *.test);;
     *)
+      grep -E '[^<]class[ \t]+[A-Z]' $tmp &&
+        diag 'Use lower case class names.'
+
       grep '[	 ]if(' $tmp &&
 	diag 'Missing space after "if"'