Save used version amongst results

[jkosciessa]

It would be great to keep track of the used version (in the case of a cloned toolbox via hashes) amongst the results (either the 'parameters' file, or as a txt file).

e.g.,

%% save current info about current version
[s,git_hash_string] = system('git rev-parse HEAD');
expInfo.version = git_hash_string;

[mekman]

Nice, PR welcome.

Please also cover the case when git history is not available. Cheers