8.4.2 Bugs Fixed

• Spurious SPIO_E_ERROR exceptions when interrupting Prolog. Most often seen when using library(timeout) or when using ^C at the top-level prompt.
• Inconsistent error messages if the license information was missing or incomplete.
• library(fdbg): inconsistent trace messages for labeling steps.
• library(clpfd): error handling for user-defined global constraint actions.
• Source info of interpreted clauses.
• Memory management issue with garbage collection + pending unblocked goals
• CHR debugging and tracing did not work.