Add -root

Adds -root parameter, to treat the whole desktop as one display, applying the image over the whole, instead of per each display.

Makefile: makes /usr/local PREFIX overidable

Arch: no longer depends on xorg-xrandr

xinerama & color names

New update of hsetroot,
changes since the last release:

• finding the details of xrandr outputs no longer uses grep and sed to parse the xrandr command line output, using libxinerama instead

• using XParseColor to parse color names - supports things like "black" or "#000" in addition to the exisitng formats

• add an (optional) hsr-outputs tool, to output output sizes and position as text, csv or json