- various clean-ups to pacify rpmlint:
    - uses spaces instead of tabs consistently
    - mark %{_datadir}/emacs/site-lisp/pari/pariemacs.txt as %doc
    - mark %{_datadir}/pari/{PARI,doc,examples} as %doc
    - fix permissions of gp
    - don't strip gp so we get debuginfo for it
    - move here documents out to separate source files
    - make gp subpackage require same version-release of main package
    - apply patch from Patrice Dumas to use xdg-open rather than xdvi to
        display DVI content, and move the xdg-open requirement from the main
        package to the gp sub-package (#530565)