ENH: avoid readScalar, readLabel etc from dictionary (#762, #1033)

- use the dictionary 'get' methods instead of readScalar for
  additional checking

     Unchecked:  readScalar(dict.lookup("key"));
     Checked:    dict.get<scalar>("key");

- In templated classes that also inherit from a dictionary, an additional
  'template' keyword will be required. Eg,

     this->coeffsDict().template get<scalar>("key");

  For this common use case, the predefined getXXX shortcuts may be
  useful. Eg,

     this->coeffsDict().getScalar("key");

src/OpenFOAM/primitives/functions/Function1/CSV/CSV.C

@@ -209,12 +209,12 @@ Foam::Function1Types::CSV<Type>::CSV
 )
 :
     TableBase<Type>(entryName, dict),
-    nHeaderLine_(readLabel(dict.lookup("nHeaderLine"))),
-    refColumn_(readLabel(dict.lookup("refColumn"))),
+    nHeaderLine_(dict.get<label>("nHeaderLine")),
+    refColumn_(dict.get<label>("refColumn")),
     componentColumns_(dict.lookup("componentColumns")),
-    separator_(dict.lookupOrDefault<string>("separator", string(","))[0]),
-    mergeSeparators_(readBool(dict.lookup("mergeSeparators"))),
-    fName_(fName != fileName::null ? fName : dict.lookup("file"))
+    separator_(dict.lookupOrDefault<string>("separator", ",")[0]),
+    mergeSeparators_(dict.get<bool>("mergeSeparators")),
+    fName_(fName.empty() ? dict.get<fileName>("file") : fName)
 {
     if (componentColumns_.size() != pTraits<Type>::nComponents)
     {

src/OpenFOAM/primitives/functions/Function1/ramp/ramp.C

@@ -30,7 +30,7 @@ License
 void Foam::Function1Types::ramp::read(const dictionary& coeffs)
 {
     start_ = coeffs.lookupOrDefault<scalar>("start", 0);
-    duration_ = coeffs.get<scalar>("duration");
+    coeffs.readEntry("duration", duration_);
 }