[det]pack_install(+Name, 
+Options)- url(+URL)
 - Source for downloading the package
 - package_directory(+Dir)
 - Directory into which to install the package
 - interactive(+Boolean)
 - Use default answer without asking the user if there is a default action.
 - silent(+Boolean)
 - If 
true(default false), suppress informational progress messages. - upgrade(+Boolean)
 - If 
true(defaultfalse), upgrade package if it is already installed. - git(+Boolean)
 - If 
true(defaultfalseunless URL ends with =.git=), assume the URL is a GIT repository. 
Non-interactive installation can be established using the option
interactive(false). It is adviced to install from a 
particular
trusted URL instead of the plain pack name for unattented 
operation.