Upgrading 2.1 to 2.2

[Thomas Kernes]

I cannot find anything including advice or just general comments concerning
upgrading an existing YDL 2.1 installation to 2.2.  Is this not easily done?
I have a fully functional server that I would like to upgrade, but I do not
want to recreate everything and I can't find any information about this
anywhere.

Is a straight upgrade even possible using the installer?  Are ALL of the
original files replaced (including conf files) by the new release?  So many
questions.

Any help would be appreciated.

Thomas Kernes