This is achieved by storing the absolute path to the dotfile directory in the
variable $DOTFILES_LOCATION. And change every hardcoded location into the
dotfiles with this var.
The Variable $DOTFILES_LOCATION populated with the output of
get_dotfiles_location.sh at 3 places:   1) config.fish | zshrc
                                        2) xinitrc (should be allready exported)

get_dotfiles_location uses the assumption that it is symlinked into the dotfiles
directory.

offlineimap:    * include patch for offlineimap
                * change config to the small one
                * include environment file in systemd unit

setup.py:       * handle offlineimap situation
                    * print a warning and prompt for proceeding
                    * write the environment file for the systemd unit
                * add pseudo dependency (get_dotfiles_location)
                    to [fish-config, offlineimap, i3]
                * print errors on stderr
                * don't exit if a function fails

config.fish:    * export $DOTFILES_LOCATION
                * change hardcoded links
                * add perl tools to path
                * export some yaourt specific vars if yaourt is available

zshrc: export $DOTFILES_LOCATION

xinitrc: export $DOTFILES_LOCATION

i3/*: change hardcoded links

scripts/* change hardcoded links

README.md: mention $DOTFILES_LOCATION

README.md:              mention that some scripts uses hardcoded locations

scripts/media_is_spotify_playing.sh:    use dbus to get spotify PlaybackStatus

scripts/media_control:  1) introduce a new file: /tmp/media_control_last
                        2) use this file to store the last active player
                        3) send the command to the last active player if no
                            player is running

1) outsource check if spotify is playing in media_is_spotify_playing.sh
2) use media_is_spotify_playing in media_status.sh
3) rework media_control using media_is_spotify_playing.sh

1) make all scripts executable
2) remove shells in exec calls
3) add toggle_touchpad script to repo

also remove bash wrapper for fish scripts and just use bash scripts