WARNING: incompatible with macOS Catalina.

Add a creation date information for each treatment inside the SDIF.

Add an editable metadata parameter in the inspector which can be used to associate an annotation to a treatment.

Supervp: Fix frequency shift filter (-Ffshift) inconsistency over time

SDIF: Fix parsing from text of matrices of characters that contain whitespace

beat/descriptors/structure: Fix potential crash with very short input