Add theme "curve"

configure

configure.in

themes/Makefile.am

themes/Makefile.in

themes/curve/Makefile.am

themes/curve/Makefile.in

themes/curve/README

themes/curve/bottom-active.xpm

themes/curve/bottom-inactive.xpm

themes/curve/bottom-left-active.xpm

themes/curve/bottom-left-inactive.xpm

themes/curve/bottom-right-active.xpm

themes/curve/bottom-right-inactive.xpm

themes/curve/close-active.xpm

themes/curve/close-inactive.xpm

themes/curve/close-pressed.xpm

themes/curve/hide-active.xpm

themes/curve/hide-inactive.xpm

themes/curve/hide-pressed.xpm

themes/curve/left-active.xpm