Replaced Write-ChocolateyFailure with Write-Host in the LibreOffice package

Be careful with the Write-ChocolateyFailure cmdlet. It’s semantically not an error when LibreOffice is already installed. By definition, an error is when something got wrong or is in an undesired state. Both does not apply here.

When someone has already installed the latest version of LibreOffice, it’s only needed to skip the download and install process. That’s nothing bad, isn’t it? :)

I already pushed the fixed version from this PR to the gallery: http://chocolatey.org/packages/libreoffice
Rob made me a co-maintainer of this package because I tried multiple times to contact you to update this package and you didn’t answer, even after several weeks.

In addition I removed the old files from the manual LibreOffice package, because they are deprecated now.