Work around a ROOT limitation when loading dictionaries

Louis Moureauxrequested to merge
lmoureau/das-core:bugfix/tests-rpath into migration

ROOT doesn't seem to understand RPATH when loading dictionaries. This was causing the Objects_Di to fail when not installed or installed out of the current path. Work around the limitation by explicitly setting LD_LIBRARY_PATH.

Closes #125 (closed).

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