ENH: unify use of dictionary method names

- previously introduced `getOrDefault` as a dictionary _get_ method,
  now complete the transition and use it everywhere instead of
  `lookupOrDefault`. This avoids mixed usage of the two methods that
  are identical in behaviour, makes for shorter names, and promotes
  the distinction between "lookup" access (ie, return a token stream,
  locate and return an entry) and "get" access (ie, the above with
  conversion to concrete types such as scalar, label etc).

src/OpenFOAM/algorithms/indexedOctree/volumeType.C

@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2013 OpenFOAM Foundation
-    Copyright (C) 2018 OpenCFD Ltd.
+    Copyright (C) 2018-2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -53,7 +53,7 @@ Foam::volumeType::volumeType
     const type deflt
 )
 :
-    t_(names.lookupOrDefault(key, dict, deflt))
+    t_(names.getOrDefault(key, dict, deflt))
 {}
 
 

src/OpenFOAM/algorithms/indexedOctree/volumeType.H

@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2014 OpenFOAM Foundation
-    Copyright (C) 2015-2019 OpenCFD Ltd.
+    Copyright (C) 2015-2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -101,7 +101,7 @@ public:
             t_(t)
         {}
 
-        //- Construct as lookupOrDefault by name from dictionary
+        //- Construct as getOrDefault by name from dictionary
         volumeType(const word& key, const dictionary& dict, const type deflt);
 
         //- Construct from integer