conv_pyra: dynamic prototxt format/generation for caffe init
split conv_util.cc into iface/impl in conv_util.{H,cc}
nesi_gen.py: generate p_cname_init() convenience factory functions with lexp/nia and nia variants. add needed underlying generic nesi convenience function for lexp/nia case (nia only case version already existed).
conv_pyra: create a p_conv_pipe_t. commit should-have-been-commited-already ..._deploy.prototxt