[DOC] Added namespaces migration documentation
Merge pull request #7 from hmspl/namespaces

[DOC] Added namespaces migration documentation
[DOC] Updated migration guide re fields rename
Merge pull request #8 from hmspl/fields

[DOC] Updated migration guide re fields rename
[DOC] Added namespaces migration script
Merge pull request #9 from hmspl/namespaces_script

[DOC] Added namespaces migration script
[BUGFIX] Fixed namespaces script
Merge pull request #10 from hmspl/content

[BUGFIX] Fixed namespaces script
[DOC] Added a clear headline and changed the order of the solutions to make the better one appear first.