Internal wrapper for creating trend and change-point summary plots
screen.summary.internal(input, mparam, type, ylabs, i, DataType, maf, Year1,
YearEnd, hyrstart)
metric time series
trend and change point info
character indicating type of summary plot
y axis labels
plot position
numeric indicating data type
mean annual flow series
start year of original time series
end year of original time series
numeric indicating month for start of the hydrologic year