gnu: gnu-pw-mgr: Upgrade to 1.1.

* gnu/packages/gnu-pw-mgr.scm (gnu-pw-mgr): Upgrade to 1.1.

Signed-off-by: Andreas Enge <andreas@enge.fr>

gnu: Add gnu-pw-mgr

* gnu/packages/gnu-pw-mgr.scm: New file
* gnu-system.am (GNU_SYSTEM_MODULES): Add it

Signed-off-by: Ludovic Courtès <ludo@gnu.org>