* Fix SSHAgent identity removal on database lock
* Refactor storage and manipulation of SSHAgent keys to streamline process with multiple db's
* Clear password field when widget is hidden, resolves#2502
This patch aims at reducing the number of copies for obejcts that could
be referenced rather than copied, because they're not modified during
the computation.
* Add Standalone Password Generator. Closes#18
* Add an entropy meter for passwords. Closes#84
* Don't require password repeat when it is visible. Fixes#27