Template and unicode classes.

Add script dealing with REGISTRY.tcl installation

- Template no longer inherits from unicode.

- SafeTemplate is removed.  Now Templates have both a substitute() and a
  safe_substitute() method, so we don't need separate classes.  No more
  __mod__() operator.

- Adopt Tim Peter's idea for giving Template a metaclass, which makes the
  delimiter, the identifier pattern, or the entire pattern easy to override
  and document, while retaining efficiency of class-time compilation of the
  regexp.

- More informative ValueError messages which will help a user narrow down the
  bogus delimiter to the line and column in the original string (helpful for
  long triple quoted strings).

this caused duplicate attributes for the bottom navigation panel.

(closes SF patch #1013055; backport candidate)

(needs documentation)

(see SF patch #901369)

Install python[w].exe on demand also as extpy[w].exe

Also added a comment about why the code is bother to see what setlocale thinks
the set locale is.

Closes bug #1023798.

decoding incomplete input (when the input stream is temporarily exhausted).
codecs.StreamReader now implements buffering, which enables proper
readline support for the UTF-16 decoders. codecs.StreamReader.read()
has a new argument chars which specifies the number of characters to
return. codecs.StreamReader.readline() and codecs.StreamReader.readlines()
have a new argument keepends. Trailing "\n"s will be stripped from the lines
if keepends is false. Added C APIs PyUnicode_DecodeUTF8Stateful and
PyUnicode_DecodeUTF16Stateful.

Apply patch from http://python.org/sf/728330 to fix socket module compilation on Solaris 2.6, HP-UX 11, AIX 5.1 and (possibly) some IRIX versions.

Remove debugging print (not triggered by test suite) and add XXX comment about how the code should raise a SyntaxError.

SF patch #1015989

The basic idea of this patch is to compute lineno attributes for all AST nodes.  The actual
implementation lead to a lot of restructing and code cleanup.

The generated AST nodes now have an optional lineno argument to constructor.  Remove the
top-level asList(), since it didn't seem to serve any purpose.  Add an __iter__ to ast nodes.
Use isinstance() instead of explicit type tests.

Change transformer to use the new lineno attribute, which replaces three lines of code with one.
Use universal newlines so that we can get rid of special-case code for line endings.  Use
lookup_node() in a few more frequently called, but simple com_xxx methods().  Change string
exception to class exception.

Several functions adopted the strategy of altering a full lengthed
string copy and resizing afterwards.  That would fail if the initial
string was short enough (0 or 1) to be interned.  Interning precluded
the subsequent resizing operation.

The solution was to make sure the initial string was at least two
characters long.

Added tests to verify that all binascii functions do not crater when
given an empty string argument.

Fix open Verbs.
Properly add "Edit with IDLE" to TclTk feature.

* Discuss the algorithmic distinctions between s.split() and s.split(sep).
* Document the split behavior for empty strings.
* Note the behavior when maxsplit is zero.
* Include short examples.