[test] Add comments showing expected provides for require_multi_versioned
[test] Fix an error in equire_multi_versioned test

idea plugin should have " = 1.4"
Reindent test XML data
[test] Fix up multi_versioned expectations as they should be
[maven.req] Fix incorrect versioned required for subpackages (rhbz#1017701)
Add further testcases for #1017702
Output all base packages not just first one (rhbz#1017702)

In theory we can create partial SCL package with parts going into SCL and parts
into base system. In base pull in jpackage-utils, in SCLs pull in appropriate
runtimes (multiple if needed)
[doc] Add "Packaging Maven project" section
[doc] Add anchors in maven.txt
[doc] Fix links