Some twiks

EstimateA_L1_logistic - corrected NaN issues when lambda=x=0 on some
components
GetStat - removed "throw away stats with low amount of measurement
heuristic". There seem to be no affect
construct_bal_weights - modified script to remove "unobserved neurons",
and make network with circular boundary conditions
construct_block_weights_lognormal.m - added a function that generarte
blocks from a lognormal distribution. Sometimes this gives better
performance