Introducing trash function, possibility to use file with custom settings

• adding trash function (moving archives with data which were deleted by user to trash folder)
• changing default names of archive with empty folders and one with summary (for compatibility with comparison made by trash function)
• info about packing by addFile function is added to summary
• extension variable used in extract.sh
• possibility to use custom file with settings (with -s parameter)
• bug in test script fixed