ligo-cbc/pycbc: O2 Production Release 7

This is the sixth production release for O2. It is based on the 1.6.4 release and contains a bug fix needed for Pegasus 4.7.4 and a fix to the instructions for OSG running. This release also contains the Einstein@Home build infrastructure for building PyInstaller bundles. The release is compatible with configuration files from https://code.pycbc.phy.syr.edu/ligo-cbc/pycbc-config/tree/v1.6.6/O2/pipeline This release has been tested against LALSuite with the hash <code>a2a5a476d33f169b8749e2840c306a48df63c936 </code> On a machine with CVMFS installed, a pre-built virtual environment is available for Red Hat 7 compatible operating systems by running the command: <code>source /cvmfs/oasis.opensciencegrid.org/ligo/sw/pycbc/x86_64_rhel_7/virtualenv/pycbc-v1.6.6/bin/activate </code> A bundled <code>pycbc_inspiral</code> executable for use on the Open Science Grid is available at <code>/cvmfs/oasis.opensciencegrid.org/ligo/sw/pycbc/x86_64_rhel_6/bundle/v1.6.6/pycbc_inspiral </code>