add some tomfoolery for CH 14
more ch 14
trying out character i/o
helper macros n stuff make succinct code
jump around inside a file - albeit w/ort char enc
string streams!
start chapter 15; add pkg, some helper functions
add 1st version of portable list-directory fun
upgrade portability in v2 of list-directory
add new helper and util funs
add some comments to our new lib
add final fun to portable pathname lib