Little changes to make things easier for new users.#1

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jeisch wants to merge 3 commits intoANNIEsoft:masterfrom

Commits on May 18, 2017

use root-config to fill the variables in the Makefile
jeisch
committed
Plots really should be in PNG format instead of jpg. Generally smaller file size and lossless compression.
jeisch
committed
make more useful filenames. (still overwrite every event)
jeisch
committed