(trunk daemon) add a systemd service file for transmission-daemon.

Suggestions / improvements welcomed at https://trac.transmissionbt.com/ticket/4503


git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14086 f4695dd4-2c0a-0410-b89c-da849a56a58e
add transmission-daemon.service to EXTRA_DIST

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14087 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk libT) fix 2.7x crash when dealing with webseeds

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14088 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk, libT) #53737 fix 2.77+ nightly regression that misreported the number of webseeds

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14089 f4695dd4-2c0a-0410-b89c-da849a56a58e