A local version label starts with a '+' sign

support dist-info distributions inside zip files

Dropped support for classifiers subsection handling in setup.cfg

 Fix hard link to URLs that should have been internal (method 2: via autosectionlabel Sphinx extension)

Add --skip-dep-install to boostrap.py script

The --skip-dep-install flag skips installation of setuptools dependencies
using pip, delegating this responsibility to other tools.  This can be used to
install setuptools without the need for pip.

closes #950

Add timestamp-based dependency system to build_clib

strip trailing slash from package_dir before counting slashes

Fix usage of extras when installing via Wheels; resolves #882

fixes #935 - allows for glob syntax in graft