Changed install targets so
(1) "make install" installs everything;
(2) more directories are built as needed;
(3) the X11R5 shell script install-sh is used (always).
(The script can't be called install.sh since some Make versions have a
default rule that copies "foo.sh" to "foo" when making "foo".)

Added target "smelly" which checks for non-Py-prefixed exported
symbols.

Added quick reference.

Changed #ifdef DEBUG slightly.

examples, which no longer live here.

Add mktime() overflow test and make it NeXT robust by initializing
the structure from localtime().

Include config.h which may define COMPILER.

dir(object) now returns object.__dict__.keys() even if __dict__ is not
a dictionary.