Tweak settings in cice concatenation

[anton-seaice]

It looks like tweaking the setting in the cice concatenation script of daily may be advantageous.

There are two things to set in ncrcat:

--cnk_csh Because the default chunk cache size of about 4 MB is too small to manipulate the large chunks ... given there is ~3GB per proc, we could presumable safely set this much bigger than 4MB (300MB+ ?)

--cnk_dmn=time,365 We could try setting this so the time chunks of daily data are the whole month

See https://nco.sourceforge.net/nco.html#Chunking for details