Revert "Updated jar2lib dependency to 1.1.2-SNAPSHOT"

This reverts commit ceea26da54a03b8af7b3fcf0bf6217ba96336588.

We *do* want to depend on release versions *only*, *always*.

Otherwise builds are not reproducible. To couple cppwrap-maven-plugin
with a SNAPSHOT version of jar2lib for development of both components
simultaneously, modify the POM locally *only* and do not commit the
changes. If the changes must be committed (e.g., to collaborate on a
work in progress with other developers or across machines), commit the
POM change as a WIP on a topic branch (*never* to master) and make sure
the WIP has been purged from the history before merging to master.
POM: use pom-loci 1.15; remove redundant config
POM: add license-maven-plugin configuration

This configures the plugin to use the BSD-2 license template.
Update license and file headers

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

I also removed some obsolete comments from CppWrapMojo.java.