Bugs in SLOCCount plugin found during development

- SLOCCount bugs in report summary fixed in its repository.
- Related TODO comments removed from TODOs plugin.
Pom.xml updates

- Pom.xml updated according to howto at https://wiki.jenkins-ci.org/display/JENKINS/Hosting+Plugins.
Headers of files

- Note "This file is part of TODOs Plugin (Jenkins CI)." added to header of all source files.