Allowed for plain text output of adjacency matrix.

There is a new SimKernel flag `FormatOutputForMathematica` that switches between MX and CSV output.
Allowed for IFT switch in MI measure.

Before, the flag `InstantFeedbackTermQ` was ignored in the case of Mutual Information. Also fixes a compiler warning.
Expanded gitignore settings.
Added ChaLearn format as possible output format.

In that case, the output will consist of lines like `100_10_0: 0.000248755870344` with 100 being the network size and the last value being the causal weight in the direction from node 10 to node 0.