extend dictionary directives

On an issue raised on cfd-online, the user was attempting to use #calc to report dictionary values. For example,

myVariable      42;
#calc "Info << $myVariable << endl";

which supposed works somehow, but I cannot figure out how.

In a somewhat similar vein (in EP1742), they were misusing #calc to perform string concatenation. For example,

_foName #calc #{ "some_prefix_solverInfo_${application}" #};
$_foName
{
   type            solverInfo;
   libs            (utilityFunctionObjects);
   fields          (".*");
}
#remove _foName;

As both cases illustrate, there must be a better way to solve this.