Fix: Quality range definitions in kbps (#157)

* Quality range uses kbits per second. Quality ranges updated for each format

* Changed vorbis q10 weight

* Fixed element name

* Added migration to keep existing MB/min quality constraints valid

* Fixed migration SQL

* Slider step now 1

* Fix: using kbps for min size as well

* Added tooltip for quality-size

* Updated AcceptableSizeSpecification test

* Small magic number fix

frontend/src/Settings/Quality/Definition/QualityDefinitions.js

@@ -28,7 +28,7 @@ class QualityDefinitions extends Component {
             <div className={styles.quality}>Quality</div>
             <div className={styles.title}>Title</div>
             <div className={styles.sizeLimit}>Size Limit</div>
-            <div className={styles.megabytesPerMinute}>Megabytes Per Minute</div>
+            <div className={styles.kilobitsPerSecond}>Kilobits Per Second</div>
           </div>
 
           <div className={styles.definitions}>