factor out most of nesi filename_t formatting code to lexp layer as str_format_from_nvm()
boda_base: filename_t-ify a few functions, update usages
boda_base: add read_whole_fn, filename_t-ize map_file_ro
add commented-out conv_ana test for 81-padding alexnet from ross
add str_format_from_nvm_str() wrapper of str_format_from_nvm()
add skeleton of conv_pyra as a test-bed for conv_ana+blf_pack integration experiments