Add mailmap to fix "git shortlog -nse"
POM: update license-maven-plugin configuration

We can use license-maven-plugin 1.6 which has bsd_2 built in.
POM: fix Mark's email address
POM: fix SCM section
POM: extend pom-loci parent

This eliminates several boilerplate configuration sections.
POM: use tabs instead of spaces for indentation
POM: tidy up order of configuration blocks

This was done using:
   mvn tidy:pom
POM: clean up license-maven-plugin config further

This removes more unnecessary sections, and fixes the copyright holder
string so that it is formatted correctly.
Update licenses

This was done using:
   mvn license:update-file-header
   mvn license:update-project-license