pyrap: HEAD

Fix formula to install HEAD. Move patches to gist.github.com and add
new patches for HEAD-only paths. Select appropriate batchbuild file.
pyrap: Reduce egg installation to standard one

Pyrap installs its components as separate eggs by default.
This causes problems for Homebrew as the easy-install.pth and site.py
files in site-packages are potentially touched by many packages.
Therefore convert the eggs back to standard "python setup.py install"
products living in a single pyrap subdirectory within site-packages.
Also remove setting of PYTHONPATH as this happens anyway within
batchbuild script.