mzxml data result

[lpatiny]

@josoriom Please check the result of the parsing for mzXML.

Currently the values are crazy, at least in the case of the 32 bits and I don't know why. Even the length of one of the test is not a multiple of 4.

Please add some tests on the expect values. For the 64 bits example the first data point should be 100 I think.

[lpatiny]

Also in the XML we have in the block the number of points. This could also be used in the check to be sure it is the correct number rather than relying on the result.