Learn w/ pre.array_size = 1, post.array_size = 2

the pre.array_size = 1 is hardcoded, error dimension is 1
just an intermediate step on the road to getting this working
Learning with post n_array multi-D ensembles

another step!
Working for basic n_array pre population

basic test with pre population n_array, d = 1, array_size = 2
TODO:
	- lots and lots of testing for different pre/post/error
          dim/array_size combinations
Test file for testing different setups

Made the learn_array test set up such that it tests a whole
bunch of different configurations of dimension and array sizes.

- Runs trial, generates figure, upon closing figure next trial runs
- Has already uncovered problems, will address shortly
Learning with network arrays working

- Submitted to a battery of tests with learning_array test
- Stipulation - error signal must have same number of dimensions
	as the post population
Decoders are now shared variables
Removed old comments about decoders hack