Local Lab build

[dngimage]

@gaaned92 and @jdc !

Testing new Local Lab:

RawTherapee_newlocallab_5.3-257-g4b2563af_WinVista_64.zip

From:

https://drive.google.com/drive/folders/0B2q9OrgyDEfPS2FpdDAtMVI1RG8

and it is running fine here!