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make ComIOException inherit public interface of ComException

Daniel Joseph Antrim requested to merge dantrim/labRemote:catch_com_exception into devel

This MR sets ComIOException to inherit the public interface of ComException, here.

Without this, code that does:


void function_foo()
{
   throw ComIOException("ComIOException thrown!");
}

int main()
{
   try {
       function_foo();
   } catch(std::exception& e)
   {
      std::cout << "exception caught: " << e.what() << std::endl;
   }
   return 0;
}

Returns terminate called after throwing an instance of 'ComIOException' instead of exception caught: ComIOException thrown!. As it stands, it is required to change the catch call to explicitly catch ComIOException: catch(ComIOException& e). This MR allows to use instead catch(std::exception& e). This may be a matter of taste about being explicit (or not) about catching specific types of exception, but this MR at least appears to complete the inheritance of std::exception that ComException begins.

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