0.2.0a2

This is the third alpha release of the 0.2 series.
Main changes with respect to the previous alpha release:

• the new default threshold is 50, not 30
• the threshold can now go below 10
• the top confidence is now 99.99, not 100. This standardizes the char length of the exported clip names
• the last 150ms of the last chunk have been removed from the detection to avoid a BVD size mismatch error
• the values of the detection curve needs have been tripled to cover the range 0-99 better