Help: Expand documentation of CMAKE_VERSION and related variables
Describe the meaning of each version component in more detail in the documentation of CMAKE_VERSION. Simplify the per-component version variable documentation by referencing the main variable. Include information about how to compare version strings. Also add an historical note about the version scheme used prior to commit v2.8.2~105^2~4 (New version scheme to support branchy workflow, 2010-04-23).
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