accordion_menu 6.x-1.3

#1808062: Always output a link on an "empty" header.
#1859520: Add an alter hook to change the menu tree and config.
#1141040: Add integration to menu_block module including a patch file.
#1616300: Document inability to remove accordion effect on "empty" headers; add emphasis to default options; improve empty header class attribution.
#1683526: Add option to not expand menu even if it is in the active trail.
#1645324: (and issue #1834254) Correct accordion JS option to allow menus to close.
#1659032: Correct display of block name in manage block page.
Correct the compilation of the block configuration settings.