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added task manager queue/pause #147

disable task manager find
set minimum dialog and task pane sizes #56
start task manager documentation #147
added Tasks user manual section #147
user manual edits
recognize .iso .img for automount
task manager adjustments
replace GTK_WIDGET_VISIBLE with gtk_widget_get_visible (since gtk 2.18)
replace gtk_object_set with g_object_set
replace GTK_WIDGET_HAS_FOCUS with gtk_widget_has_focus (since gtk 2.18)
replace GTK_WIDGET_STATE with gtk_widget_get_state (since gtk 2.18)
replace GTK_WIDGET_REALIZED with gtk_widget_get_realized (since gtk 2.20)
replace gtk_object_sink with g_object_ref_sink (since glib 2.10)
replace GTK_OBJECT with G_OBJECT
replace GtkDestroyNotify with GSourceFunc
replace GTK_WIDGET_MAPPED with gtk_widget_get_mapped (since gtk 2.20)
Remove deprecated use of GTK_WIDGET_SET_FLAGS and GTK_WIDGET_UNSET_FLAGS
Remove deprecated use of gtk_box_pack_start_defaults and GSEAL
Remove use of deprecated functions and GSEAL - exo-icon-view.c