* implemented shortcuts ("pv" for "package-validate" etc.)

* implemented shortcuts ("pv" for "package-validate" etc.)
  do "pear help shortcuts" to see what shortcuts exist
* renamed "list-installed" command to "list" and made it able to
  list the contents of installed packages as well as tar/tgz/xml files
* added some more/better command docs
* fixed up the synopsis part in the help output
* display option parameters (--foo=bar, where bar is specified in
  'shortarg' as for example 'f:bar')
* renamed list-remote-packages to list-remote
* renamed remote-package-info to remote-info