Working hdf5 saving for test_net and samc

Now need to improve and expand to classification and the simple example.

Also to reporting.
Added read_db function to samc

Also prepared next step, which is to precompute the cummean and means.
(Or should I do this locally?)
Working pytables comm, now just need report
Started on single parent TreeNet
Working kld and entropy, now needs testing
Add generateTree to treenet.py
Fix imports in exp_net
Add generateData and edge_presence to treenet.py
gitgnore .tmp
Simplify refden in log
Fix a few subtle bugs in treenet
Add ex and test tree in tests/
Enable compression in samc.pyx
Cleanup utils a bit