BF: make fslcomplex preserve image orientation

This MR fixes fslcomplex so that output files have the same orientation information as (complex) input files. The read_complexvolume function reads in a complex64 image as separate real/imaginary volume<float> objects, but was only performing a L/R flip, and was not actually setting header information in the loaded volumes.

Fixes avwutils#5 (closed)

generalio.cc

@@ -578,13 +578,13 @@ int read_complexvolume(volume<float>& realvols, volume<float>& imagvols,
 
     //Only copy real buffer for non-complex
     if (!isComplex) {
-      for ( size_t voxel=0;voxel<volsize && !isComplex;voxel++)
-        rbuffer[voxel]=((float*)buffer)[voxel];
+      for ( size_t voxel=0; voxel < volsize; voxel++)
+        rbuffer[voxel] = ((float*)buffer)[voxel];
     }
     else {
-      for ( size_t voxel=0;voxel<volsize && isComplex;voxel++) {
-        rbuffer[voxel]=((float *)buffer)[2*voxel];
-        ibuffer[voxel]=((float *)buffer)[2*voxel+1];
+      for ( size_t voxel=0; voxel < volsize; voxel++) {
+        rbuffer[voxel] = ((float *)buffer)[2*voxel];
+        ibuffer[voxel] = ((float *)buffer)[2*voxel+1];
       }
     }
     realvols.reinitialize(sx,sy,sz,st,rbuffer,true);