Other changes include:
* utils: utilsGenerateFormattedSizeString() now takes an input double instead of size_t.
* DownloadTask: calculated speed is now expressed in bytes per second, so now it's up to the caller to convert it to other units.
* DownloadTask: set download size and percentage if the download size isn't known and we're dealing with the final chunk.
* http: slightly improved CURL error info formatting.
* OptionsTab: fully implemented NSWDB XML update option.
* LayeredErrorFrame: both the error frame and the list are now protected instead of private, letting any expanded classes take more control over the them. SetErrorFrameMessage(), AddListView() and the class destructor have been removed because of this change.
* LayeredErrorFrame: removed views vector and simplified the list element focus check carried out before switching to the error frame.
