Drop support of MS-DOS, especially of the DJGPP compiler (MS-DOS port of GCC).

Today is a sad day. Good bye MS-DOS, good bye my friend :'-(

Py_TOLOWER, Py_ISSPACE, etc.

and re.subn().

Tweak docstrigs and comments in affected functions in idlelib.configHandler.

Patch by Alexander Belopolsky.

Patch by Claudiu Popa.

rename "utime" variable to "ut" to avoid conflict with the C utime() function.
Patch written by Jeffrey Armstrong.

variable to "ut" to avoid conflict with the C utime() function. Patch written
by Jeffrey Armstrong.

The result type is Py_ssize_t (and not int).

The result type is Py_ssize_t (and not int).

method so it can be reused by the new extension dialog.

_PyErr_ChainExceptions() function.

_PyErr_ChainExceptions() function.

Initial patch by Mark Shannon.

Initial patch by Mark Shannon.

The correct parameter name is "fp", not "file".

The correct parameter name is "fp", not "file".

TODOs (mostly to do after add tests), and make a few other changes.