any2matlab [FIX][API][!!!]: do not convert case of file format string
Originally any2matlab converted the file format string (format ID and subformat specifications) to lower case. This appears unnecessary and in fact results in failing code, if for example the modifier 'estimateNframes' has to be passed with 'mseed'. There currently is no obvious reason, why case conversion should be done in any2matlab. If it should turn out that existing matlab code relies on any2matlab doing this conversion, the matlab code has to be fixed, doing the conversion in matlab before calling any2matlab.