Merge pull request #1310 from akohlmey/reaxc-with-qeq-shielded

doc/src/fix_qeq.txt

examples/reax/in.reaxc.rdx-shielded

examples/reax/in.reaxc.tatb-shielded

examples/reax/log.4Jan19.reaxc.rdx-shielded.g++.1

examples/reax/log.4Jan19.reaxc.rdx-shielded.g++.4

examples/reax/log.4Jan19.reaxc.tatb-shielded.g++.1

examples/reax/log.4Jan19.reaxc.tatb-shielded.g++.4

src/QEQ/fix_qeq.cpp

src/QEQ/fix_qeq.h

src/QEQ/fix_qeq_shielded.cpp

src/QEQ/fix_qeq_shielded.h

src/USER-REAXC/pair_reaxc.cpp