[issue4541] Add str method for removing leading or trailing substrings

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I cannot say if this new set of function is desirable in python, but I know that 
I already needed this feature sometimes.
It's very easy to write in python code, though:

def rstrips(s, suffix):
    if suffix and s.endswith(suffix):
        s = s[:-len(suffix)]
    return s

About the patch:
- there is a reference leak in string_strips: lstripped must be decref'd
- this both-ends function seems less useful: prefixes are often different from 
suffixes.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue4541>
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