* Removed redundant strings.xml file (english, default one)
* Removed old and unused file from an old mercurial problem
* Removed variables which get the widgets id (discontinuing to use this way to use view ids)
* Removed  old unused and merged problem from mercurial classpath
* Added a function to check if the database is empty or not
* Added methods to show and hide the progress bar on the action bar (for fragments)
* Check if the database is empty prior to perform a query over it since is a known and unfixed bug in db4o regarding that
* Checks if the contact's adapter is empty to avoid shows the add/delete contactt dialog