unpack.class.php can now be used as a regular class from a PHP webpage.

The constructor can now handle either $argv commandline contents (which is an array) or
a passed on object containing at least 'file' for the location of the file relative to the script or
a full path and filename, provided it has access there (required) and 'storage' as in the destination
location of the files to where these are extracted, provided it has write access there (optional, the
default is the path 'root' of the script, the location from where it was executed).