* guix/build/texlive-build-system.scm (build): Ignore temporary build files
when moving runfiles around. Remove ".drv" source files prior to compiling
files. Remove need for #:TEX-DIRECTORY keyword. Handle ".ins" and ".dtx"
files in different directories.
(install): Install docfiles in "doc" output when available.
* guix/build-system/texlive.scm (texlive-build): Remove #:TEX-DIRECTORY.
* doc/guix.texi (Build Systems): Remove reference to #:TEX-DIRECTORY in
TEXLIVE-BUILD-SYSTEM documentation. Also mention it now tries to compile
".dtx" files when there is no ".ins" file.
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