Liferea Unstable 1.11.7

This is a bugfix release for the unstable line including the following changes:

    * Github #287: Add support for media:group.
      (patch by Leiaz)
    * Github #287: Fixes issues with media:content.
      (patch by Leiaz)
    * Fixes Github #283: Bad .desktop categories definition
      (reported by Wuzzy2)
    * Fixes Github #279: Fixes rules no visible in searchdialog
      (patch by Leiaz)
    * Fixes Github #278: No "Download" tab in Tools/Preferences
      (docs error, reported by Anders Jonsson)
    * Fixes Github #83: Segfault when sorting feeds in folder
      (patch by Leiaz)
    * Fixes French translation
      (patch by polo2ro)
    * Github #300: Updated manpage
      (patch by GreenLunar)

Thank you @Leiaz, @polo2ro and @GreenLunar for the patches!!!