[Avaloq] Define task parameters to be used only in the reports

When defining a task in Avaloq, it's possible to use the pseudo keyword to mark parameters that should not be passed to the underlying task, but should still be accessible from the REP DTM sources.

This is useful if their purpose is to enhance the report functionality but they do not provide meaningful input for the task procedure itself.

They are delcared as:

i_[param_name]  pseudo  [param_type] 

eg:

i_my_param  pseudo  number

And can then be accessed in the REP DTM like any other task parameter:

task_exec.param("my_param").nr_val