Note type “Other” now keeps its duration.
Add Ord instance to Duration.
In analyse, add function to separate measures.
Mesure detection before convertion in Duration.
Split “detect” function in two”.
Detect measure more cleverly.
Fix abs implementation for Duration.
Add Fractional instance to Duration.
One function to check if Duration is now basic.
Better fromInteger function. Add Enum instance.
Add instance RealFrac for Duration.
Do not export “duration” funtion anymore.
Recover code from a previous commit.

There are some memory problems.