first pass
improved doc
refactoring
run hazard if fixture is not present
removed fixture files from repository
do not restore fixtures in jenkins build script
simplify model
skip risk peb qa test as we are waiting for scientific input
refactored loss_curve_almost_equal
Merge pull request #1282 from matley/no-fixtures

Make test fixtures optional
Merge pull request #1281 from matley/workaround-print-calcs

Create job and calculation objects in a transaction
Changed the blocksize to 1: all tests pass
Changed oqtask, the progress logging and the chunkification logic in the distribution mechanism
Fixed num_tasks
Added a comment and a big docstring on num_tasks
Merge branch 'fix-blocksize' into change-dist-classical