Update Manager Commands

Commands in the um module include:

CommandDescription
cleanDelete downloaded component files from the local cache.
um-downloadDownload a component into local cache (without installing it).
installInstall a component (for example, pg16, spock, postgis).
listDisplay the available and/or installed components.
removeUn-install component (for example, pg16, spock, postgis).
updateRetrieve new list of latest components and update pgedge.
upgradePerform an upgrade of a component.
um-verify-metadataDisplay component metadata from the local store.