Installer optimization

- [x] - Invalid catalog name: 1046 No database selected
- [x] - When overriding already existing database the Integrity constraint violation occurs
- [x] - Database override message alert shows up in next step, should show up in /install/prepare
- [x] - CS-5445 - Simplify installer
- [x] - remove diplucates from authors search
- [x] - WOBS-3326 - Hidden comment is a part of points in profile

General improvements:
- improved installer itself, installing using browser and command line.

Example CLI command to install newscoop:
```
php application/console newscoop:install --fix --database_name newscoopnewtest --database_user root --database_password password --database_override
```
- themes have been removed from install folder and from themes folder
- by default no theme will be installed
- user will be able to login to backend where will fully configure newscoop (read below)

Next steps to be implemented:
 - newscoop configurator