Scatter the useful files into subdirectories by theme.

This is maybe a little random, but better ideas seem thin on the ground.

  * `build/' is for build tools: scripts and build-tool fragments which
    are handy for building projects.

  * `doc/' is for documentation, and things which help with producing
    documentation, such as styles.

  * `licence/' contains licence documents.

  * `m4/' will be for Autoconf machinery, but it's not there yet:
    splitting up `aclocal.glob' will be a job for another commit.

  * `src/' contains source code which is shared among many projects.

This commit just moves the files about.  Some of the scripts have had
their `.in' suffix stripped because they should no longer be hacked by
Autoconf or anything similar, but none of the content is modified.

diff --git a/auto-version.in b/build/auto-version
similarity index 100%
rename from auto-version.in
rename to build/auto-version

diff --git a/autotest.am b/build/autotest.am
similarity index 100%
rename from autotest.am
rename to build/autotest.am

diff --git a/confsubst.in b/build/confsubst
similarity index 100%
rename from confsubst.in
rename to build/confsubst

diff --git a/maninst b/build/maninst
similarity index 100%
rename from maninst
rename to build/maninst

diff --git a/mdwsetup.py b/build/mdwsetup.py
similarity index 100%
rename from mdwsetup.py
rename to build/mdwsetup.py

diff --git a/pysetup.mk b/build/pysetup.mk
similarity index 100%
rename from pysetup.mk
rename to build/pysetup.mk

diff --git a/testsuite.at b/build/testsuite.at
similarity index 100%
rename from testsuite.at
rename to build/testsuite.at

diff --git a/INSTALL b/doc/INSTALL
similarity index 100%
rename from INSTALL
rename to doc/INSTALL

diff --git a/texinice.tex b/doc/texinice.tex
similarity index 100%
rename from texinice.tex
rename to doc/texinice.tex

diff --git a/AGPL-3 b/licence/AGPL-3
similarity index 100%
rename from AGPL-3
rename to licence/AGPL-3

diff --git a/GPL-1 b/licence/GPL-1
similarity index 100%
rename from GPL-1
rename to licence/GPL-1

diff --git a/GPL-2 b/licence/GPL-2
similarity index 100%
rename from GPL-2
rename to licence/GPL-2

diff --git a/GPL-3 b/licence/GPL-3
similarity index 100%
rename from GPL-3
rename to licence/GPL-3

diff --git a/LGPL-2 b/licence/LGPL-2
similarity index 100%
rename from LGPL-2
rename to licence/LGPL-2

diff --git a/LGPL-2.1 b/licence/LGPL-2.1
similarity index 100%
rename from LGPL-2.1
rename to licence/LGPL-2.1

diff --git a/LGPL-3 b/licence/LGPL-3
similarity index 100%
rename from LGPL-3
rename to licence/LGPL-3

diff --git a/agpl-3.0.tex b/licence/agpl-3.0.tex
similarity index 100%
rename from agpl-3.0.tex
rename to licence/agpl-3.0.tex

diff --git a/agpl-3.0.texi b/licence/agpl-3.0.texi
similarity index 100%
rename from agpl-3.0.texi
rename to licence/agpl-3.0.texi

diff --git a/gpl-2.0.tex b/licence/gpl-2.0.tex
similarity index 100%
rename from gpl-2.0.tex
rename to licence/gpl-2.0.tex

diff --git a/gpl-2.0.texi b/licence/gpl-2.0.texi
similarity index 100%
rename from gpl-2.0.texi
rename to licence/gpl-2.0.texi

diff --git a/gpl-3.0.tex b/licence/gpl-3.0.tex
similarity index 100%
rename from gpl-3.0.tex
rename to licence/gpl-3.0.tex

diff --git a/gpl-3.0.texi b/licence/gpl-3.0.texi
similarity index 100%
rename from gpl-3.0.texi
rename to licence/gpl-3.0.texi

diff --git a/gpl.texi b/licence/gpl.texi
similarity index 100%
rename from gpl.texi
rename to licence/gpl.texi

diff --git a/latex-licence-test.tex b/licence/latex-licence-test.tex
similarity index 100%
rename from latex-licence-test.tex
rename to licence/latex-licence-test.tex

diff --git a/lgpl-2.0.tex b/licence/lgpl-2.0.tex
similarity index 100%
rename from lgpl-2.0.tex
rename to licence/lgpl-2.0.tex

diff --git a/lgpl-2.0.texi b/licence/lgpl-2.0.texi
similarity index 100%
rename from lgpl-2.0.texi
rename to licence/lgpl-2.0.texi

diff --git a/lgpl-2.1.tex b/licence/lgpl-2.1.tex
similarity index 100%
rename from lgpl-2.1.tex
rename to licence/lgpl-2.1.tex

diff --git a/lgpl-2.1.texi b/licence/lgpl-2.1.texi
similarity index 100%
rename from lgpl-2.1.texi
rename to licence/lgpl-2.1.texi

diff --git a/lgpl-3.0.tex b/licence/lgpl-3.0.tex
similarity index 100%
rename from lgpl-3.0.tex
rename to licence/lgpl-3.0.tex

diff --git a/lgpl-3.0.texi b/licence/lgpl-3.0.texi
similarity index 100%
rename from lgpl-3.0.texi
rename to licence/lgpl-3.0.texi

diff --git a/texinfo-licence-test.texi b/licence/texinfo-licence-test.texi
similarity index 100%
rename from texinfo-licence-test.texi
rename to licence/texinfo-licence-test.texi

diff --git a/getdate.h b/src/getdate.h
similarity index 100%
rename from getdate.h
rename to src/getdate.h

diff --git a/getdate.y b/src/getdate.y
similarity index 100%
rename from getdate.y
rename to src/getdate.y

diff --git a/mdwopt.c b/src/mdwopt.c
similarity index 100%
rename from mdwopt.c
rename to src/mdwopt.c

diff --git a/mdwopt.h b/src/mdwopt.h
similarity index 100%
rename from mdwopt.h
rename to src/mdwopt.h