Ger: improved infinitives (and passives); tests with more verbs in testing/german

- NP: added field isLight in order to push negation behind light nps;
  this had been done in gf-3.9 using field isPron, but isPron is now
  used to put accusative pronoun before dative pronoun. Removed field
  adv: adverbial extensions cannot be extracted (todo: also for CN).
  Reduced isLight*isPron to w:Weight with 3 values: WPron, WLight, WHeavy.

- added param Control and field ctrl:Control to classify V2V-verbs into
  subject- and object-contol verbs, use ctrl to make reflexives agree
  with subject resp. object in VPSlash, and refine ComplSlash.

- Verb: new versions of ComplVV, SlashV2V and SlashVV to give better
  (nested) infinitives (extracting infzu and correcting object order).
  a) nested SlashVV doesn't work properly;
  b) SlashV2VNP may have to be commented out to prevent a stack overflow
     when compiling.
  Intended change of SlashV2VNP in tests/german/TestLangGer could not
  be tested due to size problems with the compiler.

- VP: changed field a1 : Polarity => Str to a1:Str to collect the adverbs
  coming before negation, using (negation : Polarity => Str) in mkClause.
  Use objCtrl:Bool instead of missingAdv to let reflexives agree with object.

- ResGer: insertObjNP reorganized, infzuVP added

- DictVerbsGer: some corrections (helft -> hilft, *sprecht -> *spricht)

- Some potential passive rules in tests/german/TestLangGer|Eng

- ExtraGer needs to be cleaned up with repect to the modified mkClause.

src/german/CatGer.gf

@@ -89,7 +89,7 @@ concrete CatGer of Cat =
     V, VS, VQ = ResGer.Verb ; -- = {s : VForm => Str} ;
     VV = Verb ** {isAux : Bool} ;
     V2, VA, V2A, V2S, V2Q = Verb ** {c2 : Preposition} ;
-    V2V = Verb ** {c2 : Preposition ; isAux : Bool} ;
+    V2V = Verb ** {c2 : Preposition ; isAux : Bool ; ctrl : Control} ;
     V3 = Verb ** {c2, c3 : Preposition} ;
 
     A  = {s : Degree => AForm => Str} ;
@@ -106,7 +106,7 @@ concrete CatGer of Cat =
     Tense = {s : Str ; t : ResGer.Tense ; m : Mood} ;
 
   linref
-    NP = \np -> np.s!(NPC Nom) ++ np.adv ++ np.ext ++ np.rc ; -- HL 6/2019
+    NP = \np -> np.s!(NPC Nom) ++ np.ext ++ np.rc ; -- HL 6/2019
     CN = \cn -> cn.s ! Strong ! Pl ! Nom ++ cn.adv ++ cn.ext ++ cn.rc ! Pl ;
 
     SSlash = \ss -> ss.s ! Main ++ ss.c2.s  ;