update examples. add abcfire variants

examples/fire/in.abcfire_mod

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+# 2d Lennard-Jones melt and subsequent energy minimization
+
+units           lj
+dimension       2
+atom_style      atomic
+
+lattice         sq2 0.8442
+region          box block 0 20 0 20 -0.1 0.1
+create_box      1 box
+create_atoms    1 box
+mass            1 1.0
+
+velocity        all create 5.0 87287 loop geom
+
+pair_style      lj/cut 2.5
+pair_coeff      1 1 1.0 1.0 2.5
+pair_modify     shift yes
+
+neighbor        0.3 bin
+neigh_modify    delay 0 every 1 check yes
+
+fix             1 all nve
+fix             2 all enforce2d
+
+#dump           1 all atom 100 dump.min
+
+#dump           2 all image 50 image.*.jpg type type &
+#               zoom 1.6 adiam 1.5
+#dump_modify    2 pad 4
+
+#dump           3 all movie 50 movie.mpg type type &
+#               zoom 1.6 adiam 1.5
+#dump_modify    3 pad 4
+
+thermo          100
+
+run             1000
+
+neigh_modify    delay 0 every 1 check yes
+
+#dump_modify    1 every 25
+
+thermo          50
+min_style       fire
+min_modify      alpha0 0.10 integrator verlet abcfire yes
+minimize        0.0 1.0e-6 10000 10000