Bugfix release to reduce stack overflow errors when copying recursively

version 1.8 (2025-03-21)

* rework recursive xcopy to not use as much stack space (can be further
  reduced)

* also increase stack size when built with Open Watcom

version 1.8a (2025-03-21)

* additional reduction in stack usage to further reduce stack overflowing
  errors

version 1.8b (2025-03-21)

* bugfix - listmode /L option should not create directory structure, only
  simulate