demos/risk:

Added classical BCR risk demo.
job/validation:

Added missing `export_dir` param to risk calc validation configs.
demos/risk:

Added CPSHA demo pack.
demos/risk:

Added probabilistic event-based demo pack.
demos/risk:

Added scenario and scenario_damage demos.
Added better instrumentation to the hazard getters
Changed two descriptions
Removed the operation 'getting hazard' from the performance table
demos/risk:

Renamed hazard and risk job.ini files to be more consistent.
Fixed some points raised in https://github.com/gem/oq-engine/pull/1189
demos/risk:

Renamed risk demo folders to have better and more descriptive names.

This is also more consistent with the naming style of the hazard demos.
Merge pull request #1189 from gem/better-instrument-hg

Added better instrumentation to the hazard getters
demos/scenario_damage_risk:

Removed an unused risk demo pack.
demos/risk/Scenario/README.txt:

Added a brief README for the Scenario risk demo pack.
demos/risk:

Updated `export_dir` locations.
Merge pull request #1187 from larsbutler/new-risk-demos

New risk demos

[r=matley] [f=1180698]
merge commit