Update ledger3 to latest HEAD.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
ledger3: Use short git rev.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
ledger3: Install emacs-lisp files manually.

Build process is currently broken for emacs lisp files.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge pull request #911 from the-kenny/ledger3

Ledger 3: Update to latest git & fixes