#1 nn_trainNN.m throws an error if trainIterations is empty

[aQaSoft]

If any non scalar value or a number less than 1 is used as trainIterations, as of version nn22_v2015.03.31, nn_trainNN.m would throw "unknown variable" errors inside the main training routine.

[aQaSoft]

The variable trainIterations may be left empty by accident pressing Enter at the "How many training itarations do you want?" without entering a value.

[aQaSoft]

If any non scalar value or a number less than 1 is used as trainIterations, as of version nn22_v2015.03.31, nn_trainNN.m would throw "unknown variable" errors inside the main training routine.

The following added lines (#73 to #79) solve the issue.

% It may happen that trainIterations is not defined or is less than 1...
if (~isscalar(trainIterations) || trainIterations < 1) 
    fprintf('\n');
    fprintf(msG.error_trainIterations_IsNotDefinedOrIsLessThan1);
    returnOK = 1; return, 
end

At the same time, the corresponding message lines (#117) were added in both "nn_localization_en_US.m" and "nn_localization_es_AR.m".