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Detail:
  * Debug macros can now be used to output the value of r13 (previously, the
    value of r14 was erroneously output instead).
  * Switched from using mrs macros to mymrs macros, so builds with the
    No32BitCode flag unset are now objasm-compatible.
Admin:
  Has been used in a debugging session, and debug routines worked as expected.

Version 1.04. Tagged as 'HdrSrc-1_04'