r1980: * prerm and postrm scripts are now generated in a reverse order than

r1980: * prerm and postrm scripts are now generated in a reverse order than
  preinst and postinst scripts. For example, if a package uses
  dh_pysupport before dh_installinit, the prerm will first stop the init
  script and then remove the python files.
* Introducing beginning of v6 mode.
* dh_installwm: In v6 mode, install a slave manpage link for
  x-window-manager.1.gz. Done in v6 mode because some window managers
  probably work around this longstanding debhelper bug by registering the
  slave on their own. This bug was only fixable once programs moved out of
  /usr/X11R6. Closes: #85963
* dh_builddeb: In v6 mode, fix bug in DH_ALWAYS_EXCLUDE handling, to work
  the same as all the other code in debhelper. This could only be fixed in
  v6 mode because packages may potentially legitimately rely on the old
  buggy behavior. Closes: #242834
* dh_installman: In v6 mode, overwrite exsiting man pages. Closes: #288250