Added HDF5KeypointsWrapperBase, a lazy-loading pylearn2 wrapper to the hdf5-formatted datasets (inrialpes, ncku, ar faces, hiit6, ihdp, caltech, bioid, multi-pie, afw, aflw, labelled face parts in the wild).
Changed datasets paths to a tentative path to be corrected at a later time as needed (when the datasets are properly installed).
Revert "added some convenient SQL functions for analysis. Last changes to hps2. Small changes to hps3. Preparing to fork"

This reverts commit 0de97a47421daa112b438ce74000bed56113a001.