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Update news and readme

- better explanation of dependencies

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bzrlib/lock.py
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                raise
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            # maybe this is an old branch (before may 2005)
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            mutter("trying to create missing branch lock %r", filename)
 
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            mutter("trying to create missing branch lock %r" % filename)
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            self.f = open(filename, 'wb')
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            return self.f
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        import win32con, win32file, pywintypes
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        LOCK_SH = 0 # the default
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        LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
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        LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
 
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        #LOCK_SH = 0 # the default
 
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        #LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
 
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        #LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
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        class _w32c_FileLock(_base_Lock):
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            def _lock(self, filename, openmode, lockmode):
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        class _w32c_ReadLock(_w32c_FileLock):
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            def __init__(self, filename):
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                _w32c_FileLock._lock(self, filename, 'rb',
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                                     LOCK_NB)
 
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                _w32c_FileLock._lock(self, filename, 'rb', 0)
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        class _w32c_WriteLock(_w32c_FileLock):
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            def __init__(self, filename):
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                _w32c_FileLock._lock(self, filename, 'wb',
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                                     LOCK_EX + LOCK_NB)
 
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                                     win32con.LOCKFILE_EXCLUSIVE_LOCK)
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