Support for adjacency matrix files with node labels on the first line

[oxy86]

SocNetV should support adjacency matrix files with node labels on the first line, like this one:

# Alice, Bob, Charlie
0, 1, 1
1, 0, 0
1, 0, 0

In this example:

• The first line is a comment containing the node labels: Alice, Bob, Charlie. The line MUST be a comment (the '#' char should be automatically removed from the label by the program).
• The remaining lines form a 3x3 adjacency matrix where:
  • Row 1 corresponds to Alice
  • Row 2 corresponds to Bob
  • Row 3 corresponds to Charlie
• A "1" indicates an edge (e.g., Alice is connected to Bob and Charlie).
• A "0" indicates no edge (e.g., Bob is not connected to Charlie).