extended documentation in various formats for CMake

 CMake is used to control the software compilation process using
 simple platform and compiler independent configuration files. CMake
 generates native makefiles and workspaces that can be used in the
 compiler environment of your choice. CMake is quite sophisticated: it
 is possible to support complex environments requiring system
 configuration, pre-processor generation, code generation, and template
 instantiation.
 .
 This package provides additional documentation in various formats like HTML or
 plain text.