Merge branch 'branch-1.13.2' into maint
That branch is for the "emergency" bug-fixing release 1.13.2.
* branch-1.13.2:
maint: update copyright in files generated by automake and aclocal
tests: avoid a spurious failure when running inside Emacs
tests: make two new test executable
m4: rename an m4 file to a more appropriate name
NEWS: update w.r.t. recent documentation fixes
compat: reinstate AM_CONFIG_HEADER and AM_PROG_CC_STDC
docs: parallel-tests is no longer experimental
docs: serial-tests are not deprecated, just discouraged
NEWS: we are not going to remove AM_PROG_MKDIR_P in Automake 1.14
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>