Updated docs/scripts and docs/openbox

  * docs/scripts/misc.org: script 'urxvtq' has been superseded by script
    'urxvtfq', it uses only one urxvt window but can place or move it in
    appropriate position;
  * docs/openbox/rc.org: adopted rc configuration for new script
    'urxvtfq'; removed 'help' output because 'conky' was removed from my
    system;
  * bin/urxvtfq: new file, tangled from misc.org;
  * openbox/rc.xml, data/openbox/win.txt: regenerated;
  * rc/urxvt-position[VH][rlbt]-HOST -> rc/urxvt-[rlbt]-HOST;
  * gtk/gtk3/settings.ini: small modification, added key 'gtk-icon-theme'.