Problem:    Warning for passing pointer to non-pointer argument.
Solution:   Use zero instead of NULL.

Problem:    Modelines in source code are inconsistant.
Solution:   Use the same line in most files.  Add 'noet'.  (Naruhiko Nishino)

Problem:    Compiler warnings for non-virtual destructor.
Solution:   Mark the classe final. (Ken Takata)

Problem:    MS-Windows: more compilation warnings for destructor.
Solution:   Add "virtual". (Ken Takata)

Problem:    Typos in source files.
Solution:   Fix the typos. (Ken Takata)

for the 64 registry.