Adding lepton SFs to TLS tree

[lawrenceleejr]

Adding lepton SFs from SUSYTools. Output seems to work well.

root [2] trees_SR_->Scan("elSF")
************************
*    Row   *      elSF *
************************
*        0 * 0.9139994 *
*        1 * 0.9394007 *
*        2 *         1 *
*        3 * 1.0002898 *
*        4 * 0.9932210 *
*        5 * 0.9176160 *
*        6 *         1 *
*        7 *         1 *
*        8 *         1 *
*        9 *         1 *
*       10 * 0.9806132 *
*       11 * 0.9808974 *
*       12 * 0.9596663 *
*       13 * 0.9900363 *
*       14 * 1.0002898 *
*       15 * 0.9977179 *