Compiler error with GCC when the CMake option BTK_EXTRA_COMPILER_WARNINGS is activated.
[FIX] In case of a merging (and not a concatenation), the values for the points and the analog channels are not always correctly written (wrong number of frames to write).
[FIX] Bug in the OT XLS reader when the number of column's data is greater than the number of labels. Fix also an issue when the spatiotemporal parameters are empty as well as the events.
Because it seems GCC 4.7 does not like the Eigen::Matrix::isApprox method and because this method is not exactly what we want (we want to compare the value of each coefficient and not the Hilbert-Schmidt norm), the use of this function was replaced by some adapted code.
Following the commit 26a6af3, the unit tests are adapted to not use the method Eigen::Matrix::isApprox.
[FIX] Missing a test to know if the given corner's coordinate is equal than the stored one.
[FIX] Issue 77: "btkGetPoints has an error as pointsInfo.residuals returns an empty structure"