Updated dh_python to satisfy everybody

[Raphael Hertzog <hertzog@debian.org>]

Hi all,

given that nobody complained to my proposal of last evening, I went ahead
and implemented it.

I've updated dh_python (and the upcoming debhelper NMU 5.0.37.2) here:
http://people.debian.org/~hertzog/python/

Here's what has changed in this dh_python (taken from my debhelper
changelog):
   * Update of dh_pyhton
     - vastly refactored, easier to understand, and the difference
       between old policy and new policy is easier to grasp
     - it supports an -X option which can be used to not scan some files
     - uses debian/pyversions as reference source of information for
       dependencies but also parse the XS-Python-Version header as fallback.
     - ${python:Versions}'s default value is XS-Python-Version's value
       instead of "all" when the package doesn't depend on a
       specific python version. Closes: #373853
     - always generate ${python:Provides} and leave the responsibility to the
       maintainer to not use ${python:Provides} if he doesn't want the
       provides.
     - uses "XS-Python-Standards-Version: 0.4" as reference field to run in new
       policy mode. The presence of XS-Python-Version will also trigger the new
       policy mode (this is for short-term compatibility, it may be removed in
       the not too-distant future).

This means that the have to change the current text of the policy to enforce the
use of the "X-Python-Standards-Version" field. This field must contain the
version of the python policy that the package respects, and the current
version is "0.4".

Joe, can you do that please? I already documented that on the wiki page.

If you have that field, then dh_python can work without XS-Python-Version.
However if the field is present, it will still be used.

Joss is satisfied with this compromise and has updated his dh_pysupport 
script to not mess with the dependencies and you can find the updated
package here:
http://malsain.org/~joss/deb/

What still needs to be done:
- pyversions needs to be modified to not fail if the field
  XS-Python-Version is not present. He should in that case
  use the information of the debian/pyversions file. I will
  hopefully soon provide a patch for this.
- all those changes need to be uploaded (tomorrow should be doable)

Cheers,
-- 
Raphaël Hertzog

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