Fix a bug in kernel machine introduced in SGVector transition
Fix a bug in kernel machine introduced in SGVector transition

m_alpha has its own length and should be set and used independently from
m_svs otherwise serialization fails

shogun-toolbox/shogun,Saurabh7/shogun,sorig/shogun,lambday/shogun,Saurabh7/shogun,sorig/shogun,karlnapf/shogun,karlnapf/shogun,shogun-toolbox/shogun,lisitsyn/shogun,sorig/shogun,lisitsyn/shogun,geektoni/shogun,lisitsyn/shogun,lambday/shogun,Saurabh7/shogun,sorig/shogun,Saurabh7/shogun,lambday/shogun,besser82/shogun,lisitsyn/shogun,karlnapf/shogun,Saurabh7/shogun,karlnapf/shogun,lisitsyn/shogun,Saurabh7/shogun,lisitsyn/shogun,geektoni/shogun,geektoni/shogun,Saurabh7/shogun,lambday/shogun,shogun-toolbox/shogun,geektoni/shogun,shogun-toolbox/shogun,besser82/shogun,besser82/shogun,Saurabh7/shogun,shogun-toolbox/shogun,geektoni/shogun,sorig/shogun,Saurabh7/shogun,besser82/shogun,besser82/shogun,lambday/shogun,besser82/shogun,karlnapf/shogun,shogun-toolbox/shogun,sorig/shogun,lambday/shogun,geektoni/shogun,karlnapf/shogun