Add option to receive complete message graph

[matildeRivas]

context
When a cell starts burning, it can no longer receive messages. We only store the message corresponding to the first time a cell is reached. If fire from another neighbor reaches it, that information is not saved.

problem
It is important to know all the incoming messages for optimal firebreak placement.

Expected result
When the "all-messages" flag is active, a second messages file will be created that stores all the times fire reaches the center of a cell. Fire propagation and metrics should not be affected.