Improve content download implementation.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1348 3c3d7b80-5828-415e-9f61-280b98178fff
* Add 'Download' button to OMV.workspace.panel.Textarea panels. 
* Add 'Diagnostics | System Information | Report' page.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1349 3c3d7b80-5828-415e-9f61-280b98178fff