Dispose of Image resource
Add help_contents.xml to built plugin
fix bug where new lines were not picking up plot options from the
previous scan

This was due to the UsePreviousScanLineSetting method asking the current
and previous scan arrays to be identical but this did not take the
x-axis name into account. The previous scan should be a sub-set of the
current scan.
correct silly copy and paste error
Merge branch '8.36' of ssh://dasc-git.diamond.ac.uk/gda/gda-core into 8.36
Merge branch '8.36'
simplify configuration where you don't want to record all extra names

even leaves open how many of them your scannable may have
Merge branch '8.36'