add: 2 new propagation rules: sum_enorm for Normalized Sum-of-Sum over Edges which enhances performances with disequilibrium-tags in concurrent case + sum_log to use natural logarithm to introduce a natural tolerance for gaps in scores

Signed-off-by: Stephen L. <lrq3000@gmail.com>
edit: more efficient sum_enorm (by caching the modified adjacency matrix) + better parameters for simple_tags_concurrent.m

Signed-off-by: Stephen L. <lrq3000@gmail.com>
add: efficiency plots for tagged network

Signed-off-by: Stephen L. <lrq3000@gmail.com>
UPDATE: modularized the application into subdirectories.

Signed-off-by: Stephen L. <lrq3000@gmail.com>
add: figure 3 with edges normalization

Signed-off-by: Stephen L. <lrq3000@gmail.com>
meta-update: README.md

Signed-off-by: Stephen L. <lrq3000@gmail.com>