Parameters control updated

It is responsability of the Worker to check parameters status, not Tool. new method: boolean checkParameters() added to Worker, it must be override for all subclasses. DNAMain will call checkParameters() and if false, no new tab will be added.
WorkerScript and Worker merged

Now Worker and WorkerScript are the same class, Worker. Properties are stored in a .properties file, not a XML.
nothing relevant
Changes made to be installed in Linux
Minor changes

Haplotype updated with updateProgress method. Browser class deleted, browse method inserted into FileManager class