Mask the execute dialog until the first content to be displayed is received.

git-svn-id: svn://svn.code.sf.net/p/openmediavault/code@1415 3c3d7b80-5828-415e-9f61-280b98178fff
Only download the package if necessary.

git-svn-id: svn://svn.code.sf.net/p/openmediavault/code@1416 3c3d7b80-5828-415e-9f61-280b98178fff
Set engine module 'interfaces' dirty if hostname has been changed. Thus 'dns-search' will be updated.

git-svn-id: svn://svn.code.sf.net/p/openmediavault/code@1417 3c3d7b80-5828-415e-9f61-280b98178fff