+Merging .gcov files
+As some unit test programmes may not be able/designed to cover all
+of a module completely, the script will merge each .gcov prooduced
+with the prior, matching, file after each pass. The result is a
+final .gcov file that shows the coverage of the module over all
+tests. This allows a true coverage value to be determined while
+permitting more simple tests to be used without the requirement of
+each test to cover everything.
+
+