Enhance psxy -L to allow filling below/above line
|Target version:||Candidate for next minor release|
When plotting a y(x) curve it is sometimes useful to paint the area beneath the curve. Currently, this requires the creation of a temporary polygon based on y(x) but with added anchor points, usually via scripting with gmtconvert or awk. Instead, consider enhance the -L option with modifiers to automate this functionality. Add capability to pain either below, above, to the left, or to the right.