Setup script to place Garfield lib at first position on LD_LIBRARY_PATH instead of last

Luis Antonio Obis Apariciorequested to merge
lobisapa/garfieldpp:master into master

The goal of this small PR is to allow users with multiple installations of Garfield to select which one to use by sourcing the setup script.

Currently if you have a previous installation and you source the setup of a more recent one, it will not work since the LD_LIBRARY_PATH is appended at the end and the system will still use the previous installation library.

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