anchor.diff:  If you use `-u` option, the `feature:repo-remove` command uninstalls all features described by the features repository:
   
   ----
  -karaf@root()> feature:repo-remove -u karaf-cellar-4.0.0.RC1
  +karaf@root()> feature:repo-remove -u org.ops4j.pax.jdbc-1.3.0
   ----
   
   ===== `feature:list`
  
positive.code: ----
  
  ----
  karaf@root()> feature:repo-refresh cellar
  Refreshing feature url mvn:org.apache.karaf.cellar/apache-karaf-cellar/LATEST/xml/features
  ----
  
  ===== `feature:repo-remove`
  
  The `feature:repo-remove` command removes a features repository from the registered ones.
  
  The `feature:repo-remove` command requires a argument:
  
  * the features repository name (as displayed in the repository column of the `feature:repo-list` command output)
  * the features repository URL (as displayed in the URL column of the `feature:repo-list` command output)
  
  ----
  karaf@root()> feature:repo-remove karaf-cellar-4.0.0.RC1
  ----
  
  ----
  karaf@root()> feature:repo-remove mvn:org.apache.karaf.cellar/apache-karaf-cellar/LATEST/xml/features
  ----
  
  By default, the `feature:repo-remove` command just removes the features repository from the registered ones: it doesn't
  
negative.code: decanter=mvn:org.apache.karaf.decanter/apache-karaf-decanter/LATEST/xml/features
  ----
  
  You can directly provide a features repository name to the `feature:repo-add` command. For install, to install PAX JDBC, you can do:
  
  ----
  karaf@root()> feature:repo-add pax-jdbc
  Adding feature url mvn:org.ops4j.pax.jdbc/pax-jdbc-features/LATEST/xml/features
  ----
  
  When you don't provide the optional `version` argument, Apache Karaf installs the latest version of the features repository available.
  You can specify a target version with the `version` argument:
  
  ----
  karaf@root()> feature:repo-add pax-jdbc 1.3.0
  Adding feature url mvn:org.ops4j.pax.jdbc/pax-jdbc-features/1.3.0/xml/features
  ----
  
  Instead of providing a features repository name defined in the `etc/org.apache.karaf.features.repos.cfg` configuration file,
  you can directly provide the features repository URL to the `feature:repo-add` command:
  
  ----
  karaf@root()> feature:repo-add mvn:org.ops4j.pax.jdbc/pax-jdbc-features/1.3.0/xml/features
  Adding feature url mvn:org.ops4j.pax.jdbc/pax-jdbc-features/1.3.0/xml/features
  ----
  
  By default, the `feature:repo-add` command just registers the features repository, it doesn't install any feature.
  