ENH: more flexible finiteArea patch selection (#2084)

- support wordRes for selecting patch names

- ownerPolyPatch specification is now optional, which simplifies input
  and also supports a faMesh spanning different patches but with a
  single boundary condition.

  Alternatively, can specify more granularity if required.

  ```
  polyMeshPatches  ( "top.*" );

  boundary
  {
      inlet1
      {
          type patch;
          ownerPolyPatch top1;    // <- specific to this portion
          neighbourPolyPatch inlet;
      }
      inlet2
      {
          type patch;
          ownerPolyPatch top2;    // <- specific to this portion
          neighbourPolyPatch inlet;
      }
      outlet
      {
          type patch;
          neighbourPolyPatch outflow;
      }
      bound
      {
          type symmetry;
          neighbourPolyPatch bound;
      }
  }
  ```

tutorials/incompressible/pimpleFoam/laminar/contactAngleCavity/system/faMeshDefinition

@@ -21,21 +21,18 @@ boundary
     left
     {
         type                patch;
-        ownerPolyPatch      top;
         neighbourPolyPatch  left;
     }
 
     right
     {
         type                patch;
-        ownerPolyPatch      top;
         neighbourPolyPatch  right;
     }
 
     frontAndBack
     {
         type                empty;
-        ownerPolyPatch      top;
         neighbourPolyPatch  frontAndBack;
     }
 }

tutorials/incompressible/pimpleFoam/laminar/contaminatedDroplet2D/system/faMeshDefinition

@@ -21,7 +21,6 @@ boundary
     frontAndBack
     {
         type                empty;
-        ownerPolyPatch      freeSurface;
         neighbourPolyPatch  frontAndBack;
     }
 }

tutorials/incompressible/pimpleFoam/laminar/sloshing2D/system/faMeshDefinition

@@ -21,21 +21,18 @@ boundary
     left
     {
         type                patch;
-        ownerPolyPatch      top;
         neighbourPolyPatch  left;
     }
 
     right
     {
         type                patch;
-        ownerPolyPatch      top;
         neighbourPolyPatch  right;
     }
 
     frontAndBack
     {
         type                empty;
-        ownerPolyPatch      top;
         neighbourPolyPatch  frontAndBack;
     }
 }