[doc] fix typos in Artifact specification
[test] mocked xmvn captures its environment
[test] more flexibility for rpm testing
[test] add tests for mvn_build environment
[doc] Split "Java Specifics in Fedora"
[doc] Improve section about OpenJDK
[doc] Separate section for switching between JREs
[doc] Few words about jdb
[doc] Intro for Fedora Java Specifics section
[doc] Use list
[doc] Change section name

"OpenJDK" -> "Java implementation in Fedora"
[doc] Add tip
[doc] Split pom_ macros section into subsections
[doc] Move note about handling XML namestaces
[doc] Improve pom_ macros section a bit
[doc] pom_remove_parent is already in separate subsection
[doc] We have also pom_xpath_set
[doc] Move XMvn diagram to XMvn section

Not sure where to put it, but I have this feeling that it doesn't
belong to Maven section.
[doc] Fix a typo

Inforamtion!
[doc] :set textwidth=72