Serious changes under the hood

We made some serious changes under the hood to sort out various issues related to the management of test files.

Please test thoroughly.

Those changes require additional information in sonar-project.properties
Before:

    sonar.sources=./
    sonar.tests=./

Now:

   sonar.sources=./
   sonar.tests=./
   sonar.test.inclusions=**/**_test.go
   sonar.sources.inclusions=**/**.go

A lot of issues are marked as "resolution to be confirmed" with this release and the previous one: #56 #49 #45 #42 #35 #14

Please confirm if those issues are really solved for you.