gnulib-tool: Improve handling of multiple --local-dir options. * doc/gnulib.texi (Extending Gnulib): Explain how multiple --local-dir options work. * gnulib-tool (func_path_prepend): Remove function. (func_path_foreach): Make IFS handling more robust. (local_gnulib_path): Collect --local-dir values using func_path_append, not func_path_prepend. (func_determine_path_separator): Make IFS handling more robust. (func_lookup_file_cb): New function. (func_lookup_file): Rewritten to use func_lookup_file_cb instead of func_lookup_local_file. Apply the patches in the reverse order of their origin in $local_gnulib_path. (func_count_relative_local_gnulib_path): Make IFS handling more robust. * NEWS: Mention that the first --local-dir option is the one with highest priority.

@node License Texinfo sources
@section License Texinfo sources

Gnulib provides copies of the GNU GPL, GNU LGPL, and GNU FDL licenses
in Texinfo form.  (The master location is
@url{https://www.gnu.org/licenses/}).  These Texinfo documents do not
have any node names and structures built into them; for your manual,
you should @code{@@include} them in an appropriate @code{@@node}.

The conventional name for the GPL node is @samp{Copying} and for the FDL
@samp{GNU Free Documentation License}.  The LGPL doesn't seem to have
a conventional node name.

Of course the license texts themselves should not be changed at all.