INSTALLs in the package and wiki-documentation

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In the last time there were some problems because the install- and upgrade-manuals in the package and in the wiki are different. The devs normally only update the INSTALL-file, not the wiki. There are also specific INSTALL-files for each distro, in the wiki that's missing. At the moment there are many differences between the package- and the wiki-instructions. Even if both version work, this makes maintenance of the documentation difficult.

So I would like to discuss here this topic - perhaps we can find a better solution.
I see the following possibilities:
- We could delete the manuals for installation and RCx->RCx upgrade in the wiki and point to the INSTALL-file.
- We could copy all the different INSTALL-files into the wiki - then we have to update it if there is a change in the INSTALL file.
- We could also make a link to the wiki in the INSTALL-file.