tests/import_hazard_curves:

Updated the hazard curve import tool to use the updated nrml hazcurve
parser.
Merge pull request #1216 from larsbutler/update-hc-import-hc-parser

Hazard curve import tool: updated NRML hazard curve parser

[r=micheles] [f=*trivial]
Merge pull request #1217 from larsbutler/occupants-float

`occupants` is now a float

[r=matley] [f=*trivial]