Translator Exceptions – Internal Functions

The process internal function function used to translate internal function tokens for the get operand function was modified to throw errors.  Some of the changes made in the failed attempt to add exceptions throughout the translator routines around the get operand call used for sub-string assignments ended up in the code during the last commit.  This did not affect the functionality (since the regression tests had passed, it wasn't noticed).

The expression error status private helper function was added to determine the error status depending on whether at the last operand of the internal function, if the internal function has multiple arguments and if the bad token is a unary operator.  This function is called in three locations.

Since all errors are thrown, there was no longer a need for a return value.  The unary operator local variable was no longer needed and was removed.  The status and expected data type local variable declarations were moved closer to where they are used.  The status variable can be removed once the get expression function is modified to throw errors.

[branch misc-cpp-stl commit 640255514d]