Initial support for loading Windows7 .wim images via WinPE/ImageX.
1. Support for "one-shot" PXE booting ala the one-shot osid. Switches to pxelinux to boot WinPE and then switch back after done. Painful now because we have to HUP dhcpd everytime we change the PXE path, but we may be able to fix this in the future by going all-pxelinux-all-the-time. 2. Added pxe_select, analogous to os_select, for changing the pxe_boot_path including the one time path. 3. Added the WIMRELOAD state machine to shepherd a node through the process. Still has some rough edges and may need refining.
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