Adapt to new, stricter, rules for argument passing.

* Many modules: fixes for new, stricter, argument passing rules
  (most changes were automatic ones -- not all of this is tested!).
* gwin.py: now uses mainloop.py for its main loop and window admin.
* mainloop.py: always call dispatch() with event as a tuple!
* Fix bug in pdb's 'clear' command -- don't set the bpt but clear it!

functional)

Real important: turn off FIELDDROP in Vrec.

converted socket() to use of getargs().

(testing operations on built-in types) and autotest.py (automatic
regression testing).

  for exception before using it.  Fixed a few other places where the
  outcome of calling sq_length wasn't tested for exceptions
  (bltinmodule.c, ceval.c).

  embryonic facility for pseudo-modal dialogs.
* stdwinevents.py: added modifier masks for key/mouse events
* renamed exceptions in nntplib.py
* Changed string.join() to call string.joinfields() to profit of
  strop.joinfields()

* Makefile: change default source directory
* socketmodule.c: added getsockname and getpeername
* bltinmodule.c: corrected typo in type() error message
* Added new built-in functions str() and repr(): repr(x) == `x`;
  str(x) == x if x is a string, otherwise str(x) == repr(x).
* Added joinfields to stropmodule.c (string.join calls joinfields now)

* changed eval() into getattr() in cmd.py
* added dirname(), basename() and (dummy) normath() to macpath.py
* renamed nntp.py to nntplib.py
* Made string.index() compatible with strop.index()
* Make string.atoi('') raise string.atoi_error rather than ValueError
* Added dirname() and normpath() to posixpath.

Fixed a bug in Addmodule.sh that caused a crash in Configure.py.
Fixed the crash in Configure.py...

* flmodule.c: added {do,check}_only_forms to fl's list of functions;
  and don't print a message when an unknown object is returned.

* pythonrun.c: catch SIGHUP and SIGTERM to do essential cleanup.

* Made jpegmodule.c smaller by using getargs() and mkvalue() consistently.

* Increased parser stack size to 500 in parser.h.

* Implemented custom allocation of stack frames to frameobject.c and
  added dynamic stack overflow checks (value stack only) to ceval.c.
  (There seems to be a bug left: sometimes stack traces don't make sense.)

is moved to the sgi subdirectory.

the scanline width a multiple of 4.

VFile: use gl.gversion() to distinguish 4.0.1 and 4.0.5 Indigos;
truncate width and height to multiples of packfactor.

Vinfo: add -t to descriptive comment; print '!' after packfactor for
files that should be fixed with Vfix.

- merged CloseCompressor and CloseDecompressor into one function
- keep existing errors in error function (for exceptions raised in the
  Compress or Decompress callback functions)
- remove newline from error string generated by error function
- allocate less memory when compressing multiple frames
- keep existing errors when clCompress or clDecompress fails
- raise an exception when compressed data doesn't fit within
  dataMaxSize bytes
- allocate frameSize bytes for decompression buffer instead of
  dataMaxSize
- use mkvalue more often
- new function QueryParams which will accept CL.AUDIO and CL.VIDEO
  args
- changed some function names

using module 'jpeg' by the Displayer class.  (Unfortunately it's too
slow for real time.)  Print file size in printinfo() method.

Vinfo: added -t option (terse -- one line per file) and usage message.

Vtime: use BasicV{in,out}File classes -- the minimum needed.

Vmkjpeg, Vunjpeg: new utilities for jpeg (de)compression.