* guix/scripts/system.scm (install-grub*): Rename to install-bootloader. Use
keys to pass arguments. Pass a new argument, "installer-drv" which is a script
in store dealing with bootloader-specific install actions. Also call
"install-boot-config" to install the bootloader config file.
(install-bootloader-derivation): New procedure. It returns a derivation that
builds a file containing "install-procedure" gexp.
(perform-action): Build install-proc derivation and call install-bootloader
with the resulting file. Stop adding GRUB to PATH as bootloaders are called in
install-proc with direct store paths.
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