WIP: initialize __mapReadableInterfaces on InitFromKinBodyInfo

[eisoku9618]

InitFromKinBodyInfo() updates readable interfaces (i.e. keeps existing readable interfaces unless specified), but I think it should initialize them because the function name contains Init instead of Update.

body = RaveCreateKinBody(env, '')
kbi = KinBodyInfo()
kbi.DeserializeJSON({'readableInterfaces': {'new': 'hoge'}})
body.SetReadableInterface('old', stringreaders.CreateStringReadable('old', 'fuga'))
body.InitFromKinBodyInfo(kbi)
body.GetReadableInterfaces()

For example, body should have new readable interface only in this case.

We should initialize readable interfaces not only for InitFromKinBodyInfo() but also for the other InitXXX such as InitFromBoxes().

[rdiankov]

Thanks