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)

test/Makefile

@@ -5,7 +5,7 @@ PROJNAME   = test-newimage
 TESTXFILES = test-newimage
 
 LIBS = -lfsl-newimage -lfsl-miscmaths -lfsl-NewNifti \
-       -lfsl-cprob -lfsl-utils -lfsl-znz
+       -lfsl-cprob -lfsl-utils -lfsl-znz -lboost_unit_test_framework
 
 # The test program can be run against
 # an in-source checkout, or against
@@ -30,8 +30,13 @@ endif
 
 all: ${TESTXFILES}
 
+OBJS = test_main.o test_volume_constructor.o test_complexvolume.o
+
 # We add -I.., -L.., -Wl,-rpath so that
 # in-source builds take precedence over
 # $FSLDEVDIR/$FSLDIR
-test-newimage: test.cc
-	$(CXX) -I.. ${CXXFLAGS} -o $@ $< -L.. ${RPATH} ${LDFLAGS}
+%.o: %.cc
+	$(CXX) -I.. ${CXXFLAGS} -c -o $@ $<
+
+test-newimage: ${OBJS}
+	$(CXX) -o $@ $^ -L.. ${RPATH} ${LDFLAGS}