Air passenger data updated

I've also updated the passenger data. Again, all states seem to have provided data up to at least June 2015. See the link above.

For those of you using SDMX, there are more code changes to download these data:

• PASS_BRD_DEP has become PAS_BRD_DEP
• PASS_ST_DEP has become ST_PAS_DEP
• PASS_CAF_DEP has become CAF_PAS_DEP