Improved FSC and re-sampling

The main changes from the previous release are:
1) The FSC computation now uses the first rotation against the original position instead of the average of all pairs of rotations against the original position in most cases. The only situation where the average would be used instead of the single rotation would be where the map resolution is too low for clear distinction of the next rotation and where the first rotation gives high FSC value.
2) The map re-sampling is now done in a way that the map is over-sampled (compared to the Shannon sampling) and therefore allows more accurate interpolation onto the concentric spheres. Also, the E matrices are zero-padded to produce over-sampled rotation function to similarly allow better accuracy of mapping onto the angle-axis space spheres.
3) The symmetry detection now uses a combination of peak height (un-weighted correlation) and FSC (bin-weighted correlation) as opposed to previously used mostly FSC.
4) Seg. fault caused by integration order being supplied by the user while the progressive integration order method is being used has now been resolved.
5) Minor bug fixes and improvements.