Optimise Cell creation from scalar coordinate
Merge pull request #668 from pp-mo/grib2_soiltemp

Added Grib2 translations for 'soil_temperature'.
Cope with missing bounds
Merge pull request #659 from rhattersley/fast-coord-cell

Fast Cell construction during merge
Cope with missing climatology bounds.
update to handle up to 3 dimensional cube so that we call scoreatprecentile with
only upto 2d data.
Merge pull request #672 from rhattersley/missing-bounds

Cope with missing bounds
Merge pull request #625 from munslowa/percentile_agg

Percentile agg
Updated docs to use latest what's new.
added 42-byte wmo header, requiring code tidy
Merge pull request #610 from bblay/wmo42

added 42-byte wmo header, requiring code tidy
Merge pull request #676 from esc24/whatsnew1.5

Updated docs to use latest what's new.
Correct dim coord behaviour for aggregated by.
Merge pull request #681 from bjlittle/agg_fix

Correct dim coord behaviour for aggregated by.