fixed link macro (url_escape was called twice)
added new "link" feature to message macro
unified "hint" and common message macro
added EnvironmentWarning to header
plugin interface changed ("prepareForm" removed)
plugins do not raise exceptions anymore
first part of the partitioning plugin
device-specific stuff moved to CryptoBoxTools
WebInterfaceDataset replaces CryptoBoxWebserverSettings
WebInterfaceSites replaces CryptoBoxWebserverSites
input validation rewritten
clearsiler macro 'print_form_header' now expects the 'action' as a parameter