Integer() of enumeration value fails to flatten.

[Peter Aronsson]

the Integer() function is not implemented for enumerations.
{{{model Enumtest

type MyEnum=enumeration(A,B,C);

MyEnum A=MyEnum.A;

Integer i = Integer(A);
end Enumtest;}}}

Results in the following message:
{{{Error processing file: Enumtest.mo
Error: No matching function found for Integer(A) of type function(x:enumeration(A, B, C)) => Integer, candidates are function(x:enumeration()) => Integer
Error: Wrong type or wrong number of arguments to Integer(A)'.
}}}

[Peter Aronsson]

(MathCore TRAC: ​http://intranet/trac/mathmodelica/ticket/2934)

[Martin Sjölund]

Fixed in r5958
Added testcase mofiles/Enum11.mo