Many pages: Move type pages to subsection 3type

Many pages: Move type pages to subsection 3type

These pages are not exactly what man3 typically contains, which is
library functions.  Instead, types fit better in a subsection of
man3, and some UNIX systems have already a section 3type, so let's
use the same name.

Adapt the Makefile to work with this subsection.  Except for the
Makefile, these changes are scripted.

Scripted changes:

$ find man3 -type f \
  | grep '_t\.3$' \
  | while read f; do
	mv $f ${f}type;
  done;

$ find man? -type f \
  | xargs grep -l '^\.so.*_t\.3' \
  | xargs sed -i '/^\.so/s/\.3$/\.3type/';

$ find man? -type f \
  | xargs grep -l '^\.BR .*_t (3)' \
  | xargs sed -i '/^\.BR .*_t (3)/s/3)/3type)/';

$ find man? -type f \
  | grep -- '-struct\.[23]$' \
  | while read f; do
	g="$(echo $f | sed 's/-struct//')"type;

	mv $f $g;
  done;

$ find man? -type f \
  | xargs grep -l '^\.so.*-struct\.[23]' \
  | xargs sed -i -e '/^\.so/s/-struct//' -e '/^\.so/s/$/type/';

$ find man? -type f \
  | xargs grep -l '^\.BR .*-struct (.)' \
  | xargs sed -i -e '/^\.BR .*-struct (.)/s/\([23]\)/\1type/' \
                 -e '/^\.BR .*-struct /s/-struct//';

$ find man? -type f \
  | grep -- '-union\.[23]$' \
  | while read f; do
	g="$(echo $f | sed 's/-union//')"type;

	mv $f $g;
  done;

$ find man? -type f \
  | grep '3type' \
  | xargs sed -i '/^\.TH/s/ 3 / 3type /';

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>