Adjust navigate-find-end-of-act so that it will sort empty act.

This is a bit pathological but as it turns out the fix makes all sorting a bit faster.
Inherit standard font lock faces where appropriate
Tweak ledger-clean-up to attempt to find the exact you were at when you ordered the clean.
Merge branch 'master' of https://github.com/ledger/ledger
Don't hard-code ledger-font-default-face to black
Make reconcile more robust to empty or bad account entries at the prompt.
Merge commit '30df70ab1b02a05b4fc1198c932c4536dd480ef1'