refs #787, utility functions for shared files

* get file name from URL
* service and file names in CDbInfo
* adjusted DB flags, allow to load headers only
* set of entity flags

src/blackmisc/network/url.h

@@ -115,6 +115,9 @@ namespace BlackMisc
             //! Set full URL
             void setFullUrl(const QString &fullUrl);
 
+            //! File name
+            QString getFileName() const;
+
             //! To QUrl
             QUrl toQUrl() const;