added two example rasters, modified help files, deleted unused files.

	deleted:    DESCRIPTION~
	modified:   inst/extdata/p1dens.tif
	new file:   inst/extdata/p1dens.tif.aux.xml
	modified:   inst/extdata/p2dens.tif
	new file:   inst/extdata/p2dens.tif.aux.xml
	modified:   man/FocusMap.Rd
	modified:   man/LoadRasterLayers.Rd
	modified:   man/NormalizeLayer.Rd
	modified:   man/ResampleLayers.Rd
	modified:   man/focusmapr-package.Rd
	deleted:    man/focusmapr-package.Rd~