Switch from videostab2 to vidstab filter.
Update stabilize filter to match MLT change to store results in a file
Add audio loudness filter
Resolve comments from 54facb6fc4e1cddc4e35885222e3161e1db49d3f

* typo
* correct string length math
* whitespace
Resolve comments on 0f2689d64660c6f44c039dae4cfe69bc1a0a5a70

* Replace the current "Normalize" filter
* Rename to "Normalize"
* Remove extra label
* Shorten label
* Fix undo value
Merge pull request #10 from pez4brian/master

Switch from videostab2 to vidstab filter.