Added new BP::Model::CV::Namespace class, to be used everywhere
Removed unneeded perl modules.
Terms now have an optional namespace, which is also used on OBO dump
Forgot to add the namespace to the constructor.
More fixes related to CV namespaces at Term level
Micro-optimizations on namespace handling
Added default namespace OBO serialization
Added uriKey and uriKeys methods to BP::Model::CV::Term, so the BP::Model::CV instance can fetch the uri keys in a later stage
Added support to namespace handling and parsing at CV and term levels. Now terms from undeclared namespaces are ignored.
Improved documentation generation: it is provided a link to the URI on CV terms which have it