Allow passing sum_modes through initialise

Signed-off-by: Mark Hymers <mark.hymers@ynic.york.ac.uk>
1 job for 19-pass-sum_modes-down-in-modalmvar-metrics-to-allow-flexibility-in-use in 5 minutes and 33 seconds (queued for 1 minute and 51 seconds)
Status Job ID Name Coverage
  Build Test
passed #1872
build_test

00:05:33