Updating commands doc to use https instead of git

Add nmount system call

nboot: don't change uart settings for choice 'A'..'D'

termrc: set a default resolution 1024x768x32 not 1280x1024x32

Fix 9k build problem with gpf vector

rdmsr: Don't panic on user GPF.

Don't bother building man pages and indexes, they are already built.

Make the usb build script use nboot.

Enable build scripts to run on mac (without kvm)

Add runcoreboot script so we can experiment with UEFI failure

9boot: fix isowalk() for directories spanning multiple sectors

9boot: handle automatic length for 64-bit values in hexfmt() for framebuffer address (thanks Michael Forney)

9boot: mark efi boot and runtime service regions as reserved

efi: prefer plan9.ini from ESP we loaded from

9bootpxe: simplify