[MERGE][1.0] disable python imports from cwd (problem with python2.4 @ win32: bug #53478)

[Alexander Belchenko]

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This patch fixes problem with python 2.4 that annoys me for years:

if I have bzr installed for my Python (i.e. in site-packages) and
I cd to bzr sources directory, then running system-wide bzr I constantly
have problems because bzr try to import bzrlib from current directory
first, not from site-packages.

Proposed patch fixes all possible variants and works with 2.4 and 2.5.
In my strong opinion we should not manipulate with sys.path in bzrlib itself,
only in bzr script. Therefore I did only manual testing.

More details about this bug see in comments:
https://bugs.launchpad.net/bzr/+bug/53478

Alexander
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