Added method to create a span zip file from a list of folder#1

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giusgat wants to merge 4 commits intosupasate:masterfrom

Commits on Mar 16, 2018

Added method to create a span zip file from a list of folder
giusgat
committed

Commits on Mar 19, 2018

restituito il progressmonitor dalla chiamata alla zipfolders
giusgat
committed

Commits on Mar 20, 2018

Fix gestione cartelle da zippare in posizione diversa
giusgat
committed
Added, in ZipParameters, a property to keep track of different rootfolders.
giusgat
committed