switch to waf buildsystem

[iioflow]

forget all that destdir and makefile cruft. unneeded. i wrote a waf buildsystem and it works like clockwork. much easier to install and maintain the code, and i updated the README with the new install instructions:

./waf configure ./waf ./waf install

configure takes the standard --prefix=/foo for installing to someplace besides /usr/local, if desired. artfwo helped me on a couple of the finer points of the wscript after my initial solo coding process, which is why i made several small changes starting at id#7337524. he reviewed and vetted my python shtuff and found no further issues, hence the pullreq at.last

[iioflow]

updated with new pull req. basically, forget makefile crap. see original request/description.