inputpath: Colon-separated list

[AndreiCherniaev]

At this moment I can't use inputpath with not one, but a list of paths. Why? i suggest allow something like

/mnt/ramdisk/buildroot/board/pc$ genimage --config genimage-bios.cfg --inputpath /mnt/ramdisk/buildroot/output/images/:/mnt/ramdisk/buildroot/output/target/lib/grub/i386-pc/ --outputpath /mnt/ramdisk/buildroot/output/images/

At this moment I can use includepath with a list of options, but includepath is for .cfg files only, I can't set in genimage-bios.cfg

	partition boot {
		in-partition-table = "no"
		image = include("boot.img") #error
		offset = 0
		size = 512
		holes = {"(440; 512)"}
	}

includepath use set_include_path() to parse a list, I thing something the same we should use for inputpath. Isn't it? And of cause if there are two files with one name genimage should produce error... (And we need at autotest for this situation)