ENH: dynamicCode: include unitConversion by default

etc/codeTemplates/dynamicCode/codeStreamTemplate.C

@@ -29,6 +29,7 @@ Description
 #include "dictionary.H"
 #include "Ostream.H"
 #include "Pstream.H"
+#include "unitConversion.H"
 
 //{{{ begin codeInclude
 ${codeInclude}

etc/codeTemplates/dynamicCode/fixedValueFvPatchFieldTemplate.C

@@ -28,6 +28,7 @@ License
 #include "fvPatchFieldMapper.H"
 #include "volFields.H"
 #include "surfaceFields.H"
+#include "unitConversion.H"
 //{{{ begin codeInclude
 ${codeInclude}
 //}}} end codeInclude

etc/codeTemplates/dynamicCode/functionObjectTemplate.C

@@ -26,6 +26,7 @@ License
 #include "functionObjectTemplate.H"
 #include "Time.H"
 #include "fvCFD.H"
+#include "unitConversion.H"
 
 //{{{ begin codeInclude
 ${codeInclude}