Update bug reporting instructions.

Update bug reporting instructions.

* README: Tell users to report bugs in the bug tracker or by email. Use the
mailing list address, not the alias.
* gettext-runtime/libasprintf/README: Likewise.
* gettext-tools/doc/gettext.texi (Introduction): Likewise.
(Plural forms): Use the mailing list address, not the alias.
* configure.ac (AC_INIT): Use the mailing list address, not the alias.
* gettext-runtime/configure.ac (AC_INIT): Likewise.
* gettext-tools/configure.ac (AC_INIT): Likewise.
* gettext-tools/examples/configure.ac (AC_INIT): Likewise.
* gettext-runtime/po/Makevars (MSGID_BUGS_ADDRESS): Use the mailing list
address, not the alias.
* gettext-tools/po/Makevars (MSGID_BUGS_ADDRESS): Likewise.
* gettext-tools/examples/po/Makefile.am (MSGID_BUGS_ADDRESS): Likewise.
* gettext-tools/examples/hello-*/po/Makevars (MSGID_BUGS_ADDRESS): Likewise.
* gettext-tools/examples/hello-*/po/Makefile.am (MSGID_BUGS_ADDRESS): Likewise.
* gettext-tools/examples/hello-objc-gnustep/po/GNUmakefile (MSGID_BUGS_ADDRESS):
Likewise.
* gettext-tools/examples/hello-c++-kde/hello.cc (main): Likewise.
* gettext-runtime/src/envsubst.c (main): Move URL out of translatable string.
(usage): Tell users to report bugs in the bug tracker or by email. Use the
mailing list address, not the alias.
* gettext-runtime/src/gettext.c: Likewise.
* gettext-runtime/src/ngettext.c: Likewise.
* gettext-tools/src/cldr-plurals.c: Likewise.
* gettext-tools/src/hostname.c: Likewise.
* gettext-tools/src/msgattrib.c: Likewise.
* gettext-tools/src/msgcat.c: Likewise.
* gettext-tools/src/msgcmp.c: Likewise.
* gettext-tools/src/msgcomm.c: Likewise.
* gettext-tools/src/msgconv.c: Likewise.
* gettext-tools/src/msgen.c: Likewise.
* gettext-tools/src/msgexec.c: Likewise.
* gettext-tools/src/msgfilter.c: Likewise.
* gettext-tools/src/msgfmt.c: Likewise.
* gettext-tools/src/msggrep.c: Likewise.
* gettext-tools/src/msginit.c: Likewise.
* gettext-tools/src/msgmerge.c: Likewise.
* gettext-tools/src/msgunfmt.c: Likewise.
* gettext-tools/src/msguniq.c: Likewise.
* gettext-tools/src/recode-sr-latin.c: Likewise.
* gettext-tools/src/urlget.c: Likewise.
* gettext-tools/src/xgettext.c: Likewise.
* gettext-tools/tests/tstgettext.c: Likewise.
* gettext-tools/tests/tstngettext.c: Likewise.
* gettext-tools/misc/autopoint.in (func_usage): Tell users to report bugs in the
bug tracker or by email. Use the mailing list address, not the alias.
* gettext-tools/misc/convert-archive.in (func_usage): Likewise.
* gettext-tools/misc/gettextize.in (func_usage): Likewise.