very preliminary sketch of parallel version
shareglrm.jl modified to broadcast
removed AT
parallel approach works if not embedded in function, but fails inside function
added test script
Amit Murthy's test
merge
shareglrm works! run using eg examples/sharetest.jl
typos
localcols now returns integers
observed features and examples stored as ranges for dense matrices
clean up shareglrm code
fixed error in precision_at_k
use shareglrm whenever nprocs()>1