* add more __init__ tests

* use assertions instead of tests after internal calls that can't fail.
* expand test coverage

c.l.py

methods on string and unicode objects. Added unicode.decode()
which was missing for no apparent reason.

first day of the week.

[ 987287 ] Python 2.4a1, interpreter hanging on Keyboard Interrupt

couple of these are currently found in index data, but these should
all be handled in the same way.

Closes SF bug #952737.

Need to return -1 on error.

Needs backport.

isn't always set to an integer value when it's defined.

[ 960406 ] unblock signals in threads

although the changes do not correspond exactly to any patch attached to
that report.

Non-main threads no longer have all signals masked.

A different interface to readline is used.

The handling of signals inside calls to PyOS_Readline is now rather
different.

These changes are all a bit scary!  Review and cross-platform testing
much appreciated.

[Bug #925107] Make .readline() consider self.stop.  This makes read() and readline() very similar, so they're refactored into _read.  Patch by Johannes Gijsbers.
2.3 bugfix candidate.

Rearrange code for writable() case to make the parallel logic clearer

Fixes SF #984290.