requirements: better separation

* Moves PIL and qrcode to separate requirements file as they are needed together
for formatting records;
* Removes iPython from -extras as it is already included in -dev.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
installation: MANIFEST.in file recursive-include fix
Merge remote-tracking branch 'adrianp-github/pu-it' into pu