mysql should use utf8

[lifeofguenter]

There is no reason nowadays for MySQL tables to not have utf8 as charset - especially the connection of the client should "talk utf8".

The pages already make usage of utf8 (via header + html).

This might not be backward compatible (for example if you were using non-ascii chars as username).

[SebTM]

I think switching to utf8 is an important step for v2.1.8 so we should do this. Is it enough just to warn the user in README and update-script that we are switching to utf8 and he have to take care of his users before? What about the other database-systems - do we need to change something here? I'm not familiar with pgsql etc.

[edmondas]

In my opinion there's work that's need to be done, because I prefer to keep backward compatibility just not to make existing users angry about new version that breaks everything. My plan is:

1. Add config variable for db encoding (default value will be latin1)
2. Add encoding/collation selection to installer
3. Add support for other databases (pgsql and sqlite)

[edmondas]

It seems that it would take time to implement everything that I wrote above, so I will merge it and just cleanup it a bit to keep backward compatibility.