Load Coordinates directly

It used to be loaded by 02-load.r but is no longer necessary for most reporting functions as all the spatial calculations are done at a higher level and recorded in output/meshblockData.txt
Some bugfixes, more to come.
require(grid) for unit()

Don't understand why this was never a problem before.
Fix column names and crashes$hour arithemtic.

It seems that sometimes CAS uses the sensible 0-23 range of hours, rather than 1-25 with 25 as the NULL magic number.
Redraw map for Auckland City.

Could build up districts from meshblocks rather than gIntersection them against the coastpoly.