Change version and update thanks section
Merge branch '1.3.x'
Merge tag '1.3.1' into 1.3.x

Galicaster release 1.3.1
Change version name in __init__ from 1.3.1 to 1.3.x
Added new vumeter in recorder window
Deleted developer utility, no importance
Bug fixed recording with datapath
Change once again the version name in __init__ from 1.3.1 to 1.3.x