alt_barproj: Plot grouped projection bars with inner shading
In jonasbhend/NRMgraphics: Graphics and analysis for the NRM projections project

Bar plots grouped by scneario or seas with inner shading reflecting natural variability.

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alt_barproj(meanchange, meansd = NULL, ylim = NULL, col = hcl(c(240, 0), l
  = 60, c = 50), col2 = hcl(c(240, 0), l = 30, c = 80), lwd = 10,
  siglevel = 0.2, lty = 1, distance = 0.5)

`meanchange`	list of percentile changes
`meansd`	list of standard dev. or percentile changes for nat. var.
`ylim`	vertical extent of plot
`col,col2`	colours for positive and negative segments of bars
`lwd`	bar width
`siglevel`	significance level to convert sdev. to shading ranges
`lty`	line type for horizontal grid lines
`distance`	relative distance between group of bars