Can't generate time averages for non-january first initialized runs

[uwagura]

The make time averages script assumes that all runs in end in December, but for non-january 1st initialized runs, this may not be the case:

fre-workflows/app/make-timeavgs/bin/make-timeavgs

Lines 57 to 59 in c18dedd

	#now need to pick the right date-time format for the cycle-point
	if [[ $file_freq == P1M ]]; then
	cyclepoint=$(cylc cycle-point --template CCYY12)

As a result, when you try to ls the file names a couple of lines later, it will fail because it won't fine files ending in YYYY12

fre-workflows/app/make-timeavgs/bin/make-timeavgs

Line 69 in c18dedd

files=($(ls $dir/$interval/$component.*-$cyclepoint.*.nc))