Commit23116d5

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Add a bit more commentary about regex's colormap tree data structure.

Per an off-list question from Piotr Stefaniak.

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Original file line number	Diff line number	Diff line change
`@@ -162,6 +162,10 @@ typedef int pcolor;/* what color promotes to */`
`162`	`162`	`* deep (in the past it was shallower during construction but was "filled"`
`163`	`163`	`* to full depth at the end of that); areas that are unaltered as yet point`
`164`	`164`	`* to "fill blocks" which are entirely WHITE in color.`
	`165`	`+ *`
	`166`	`+ * Leaf-level tree blocks are of type "struct colors", while upper-level`
	`167`	`+ * blocks are of type "struct ptrs". Pointers into the tree are generally`
	`168`	`+ * declared as "union tree *" to be agnostic about what level they point to.`
`165`	`169`	`*/`
`166`	`170`
`167`	`171`	`/* the tree itself */`
`@@ -179,6 +183,7 @@ union tree`
`179`	`183`	`structptrsptrs;`
`180`	`184`	`};`
`181`	`185`
	`186`	`+/* use these pseudo-field names when dereferencing a "union tree" pointer */`
`182`	`187`	`#definetcolorcolors.ccolor`
`183`	`188`	`#definetptrptrs.pptr`
`184`	`189`

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