Installation year removed from TeXLive installation

TeXLive recently transitioned from its 2019 version to its 2020 version
thanks to Elham Saremi's trial of the this project. The fact that
traditionally Maneage installs all TeXLive packages in a per-year directory
is very annoying and required an update in the core Maneage system every
year. So I suddently recognized that we can fix this by setting a different
name for the directory holding the release year. This has been implemented
with this commit.

I have also done this change in the main Maneage branch for other projects
to also benefit from this correction.

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