Implementation of code coverage analyzer.
Set path to where source files are located.
| string pathname | The new path name. | 
Set path to where listing files are to be written.
| string pathname | The new path name. | 
Set merge mode.
| bool flag | true means new data is summed with existing data in the listing file; false means a new listing file is always created. | 
The coverage callback.
| string filename | The name of the coverage file. | 
| size_t[] valid | ??? | 
| uint[] data | ??? | 
| ubyte minPercent | minimal coverage of the module | 
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Licensed under the Boost License 1.0.
    https://dlang.org/phobos/rt_cover.html