* Spotbugs, PMD and Checkstyle #33
* Reducing Spotbugs effort to min #33
* Also using project.parent.basedir and avoiding relative paths in pom files.
* Filtering out samples.
* Move PMD/Spotbugs to static-analysis profile
This moves the static-analysis checks to a standalone profile. Core
contributors may run static analysis with:
```
mvn -Pstatic-analysis install
```
The analysis is separated from default functionality to reduce impact to
community contributions. SpotBugs/PMD may add a non-trivial amount of
time to builds on some machines.
Co-authored-by: Tomas Bjerre <tomas.bjerre85@gmail.com>
