Add a new USE_LIBTOOL definition that uses the libtool package instead of
pkglibtool which is now considered outdated.
USE_PKGLIBTOOL is available for backwards compatibility with old packages
but is deprecated for new packages.
- fixes some small bugs
- three theme configuration options have been added:
- enable/disable NeXTSTEP(R) style lists with dark background
- enable/disable NeXTSTEP(R) style scrollbars (on the bottom left)
- enable/disable GTK+ style prelighting if mouse is over top of widget