Master key transformations (rounds) are now computed in two threads (from KeePass 1.11)

Added a button to measure the number of rounds that can be calculated in 1 second
Don't try to open a URL when it's empty
Improved code formatting

git-svn-id: https://svn.code.sf.net/p/keepassx/code/trunk@194 b624d157-de02-0410-bad0-e51aec6abb33

src/lib/tools.cpp

@@ -82,6 +82,9 @@ void openBrowser(IEntryHandle* entry){
 }
 
 void openBrowser(const QString& UrlString){
+	if (UrlString.trimmed().isEmpty())
+		return;
+	
 	if (UrlString.startsWith("cmd://") && UrlString.length()>6){
 		QProcess::startDetached(UrlString.right(UrlString.length()-6));
 		return;