Finally i am up and running with 1.20.1 (Yum) after failing to install from source with version 1.21.0 (don't ask why, i just couldn't get it going).

Unfortunately in 1.20.1 i see that still quite a few logs of mine do contain some error messages.
I could go and try to solve all of these here in 1.20.1 , or i could try to upgrade to 1.21.0, the version in which quite a few (>13) bugfixes have been implemented (and thus maybe less errors in logfiles).

So, my question is, after i installed 1.20.1 with Yum (by far the easyest way), how do i proceed with upgrading to 1.21.0?

I understand that upgrading from source is quite different from upgrading after installing through RPM or Yum? I know that it should be done with the upgrade scripts. My database contains no data of interest for me, it has been running for a few days without actually collecting interesting stuff. So i wouldn't mind my database being flushed.
Any help is much appreciated!
Ed.