Obtain plot lines from a channel group

[dladams]

Tools AdcDataPlotter and AdcChannelMetric provide users with the option to draw lines corresponding to an explicit pattern of channel numbers. This is typically used to show plane and FEMB-view boundaries. We would like to have the option to provide a channel range group name and use the boundaries of the ranges in that group to specify the line positions.

[dladams]

Preliminary plan to carry this out for AdcChannelMetric is to add a fcl option ChannelLineGroup which holds the channel range group name. It would be used with the tool channelGroups to fetch the range names, their boundaries obtained with the tool channelRanges, and their boundaries merged with the pattern provided in the existing fcl param ChannelLinePattern to obtain the pattern used for the plot.