OpenQuake Hazardlib 0.20.0

[Michele Simionato (@micheles)]

• Fixed the serialization on HDF5 of dictionaries with keys containing slashes
• Renamed Imtls -> DictArray
• Removed the .id attribute from the Site class

[Graeme Weatherill (@g-weatherill)]

• Updates coefficients to Montalva et al. GMPE and updates year to 2016

[Michele Simionato (@micheles)]

• Added a Tile class to filter efficiently point sources
• Removed the function hazard_curve.hazard_curves that has been
  deprecated from November 2014
• Fixed the string representation of GSIM instances: this solves a serious
  bug in the GMPETable
• Removed the rupture_site_filter where it was not used

[Daniele Viganò (@daniviga)]

• Added support for Ubuntu 16.04 (xenial) packages

[Michele Simionato (@micheles)]

• Major change to the GmfCalculator API

[Matteo Nastasi (@nastasi-oq)]

• Backport of libhdf5 and h5py for ubuntu 'precise' serie

[Michele Simionato (@micheles)]

• Added a PickleableSequence class to serialize Python objects on HDF5

[Graeme Weatherill (@g-weatherill)]

• Fixes Z1.0 units bug in Abrahamson, Silva and Kamai (2014)
• Added modifications to Zhao (2006) inslab GMPE and implements
  Atkinson (2008') - needed for 2014 US NSHMP

[Michele Simionato (@micheles)]

• Improved the validity check on the Intensity Measure Type
• Showing the calc_id in Monitor instances string representation
• Added a h5py.File subclass to manage the serialization of objects
  satisfying the HDF5 protocol used by the OpenQuake software
• Added a LiteralAttrs class to serialize literal attributes on HDF5
• Added to the Monitor the ability to send commands