Huge piece of changes (you need to remove old backup and download again)

* Added timeout for url requests
* Added moar error catching & reporting
* Redesigned database to allow store & read recursive path keys
* Multithreading download of media files (with download-threads option)
* Media also stores metadata of items
* Downloading of profile photos for all users
* Downloading user photos & blog for your user
* A number of small bugfixes