- rewrite shebangs by default (disable via --no-shebang-rewrite),
    examples:
     + "/usr/bin/env python*" → "/usr/bin/python*"
     + "/usr/local/bin/python foo" → "/usr/bin/python foo"
     + "/usr/bin/python2" → "/usr/bin/python"
  - new --shebang option to replace all shebangs in bin dirs
    (example: --shebang /usr/bin/python2.6)

dh_python2: fix parsing .pyinstall files (a space between file name and module name is now required)

as public modules for all requested Python versions (use dh_install's
package.install files for private modules)

* ignore dh's -O option
* allow multiple -p options
* add -N option

* make sure pycompile binary is available at intall time
* do not require pyclean at uninstall time

(f.e. when moved to another package)