Align behavior of xmethod commands with that of pretty-printer commands.

Currently, the xmethod commands lookup xmethod matchers in the current
progspace even if the locus regular expression matches the progspace's
filename.  Pretty printer commands do not match the current progspace's
filename.

gdb/

	* python/lib/gdb/command/xmethods.py
	(get_method_matchers_in_loci):  Lookup xmethod matchers in the
	current progspace only if the string "progspace" matches LOCUS_RE.

gdb/testsuite

	* gdb.python/py-xmethods.exp: Use "progspace" instead of the
	progspace's filename in 'info', 'enable' and 'disable' command
	tests.
Fix fallout from 6d00b590

bfd/ChangeLog:

	* targets.c (_bfd_target_vector): Add missing #ifdef BFD64 for
	a number of targets.
Minor improvements in manual indexing.

	* doc/gdb.texinfo (Screen Size): Add more index entries.

(cherry picked from commit f179cf97a071940bfce6879aa59dbac66ffca391)
Automatic date update in version.in