dialog.
Move Find Usage code from on_find_usage1_activate to search.c.
Add ui_button_new_with_image(), ui_hbutton_box_copy_layout().


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@951 ea778897-0a13-0410-b9d1-a72fbfd435f5