Merge remote-tracking branch 'hewenbin/master' into vortex
gen vortex detection
default vector size
VortexDetector
	new file:   Regular/Serial/convertCurvilinear.C
	new file:   Regular/Serial/readLabels.cpp
	modified:   VTK/examples/StreamlineRenderPlot3D.cpp
Minor performance fix
	modified:   VortexDetector.C
Add description
	modified:   ../../VTK/VectorFieldVTK.cxx
multiblock support (not tested)
	modified:   ../../VTK/examples/StreamlineSimpleVTK.cpp
Autodetect plot3d format
	modified:   ../../VTK/examples/vec2vti.cpp
	modified:   ../../renderer/examples/gcbStreamline.cpp
Drastically increase the color assignment speed
Merge branch 'vortex'

Conflicts:
	VTK/VectorFieldVTK.cxx
	src/Field.C
delete unused file
multiblock support. Use MultiBlockVectorFieldVTK class
osx fix
add Multiblock example.  Vortex / Jacobian calculation with user-specified unit.
Multiblock:
	modified:   VTK/MultiBlockVectorFieldVTK.cxx
	new file:   VTK/examples/StreamlineRenderMultiBlock.cpp
Vortex / Jacobian computation:
	modified:   src/Field.C
	modified:   src/Field.h
Merge remote-tracking branch 'origin/osx_fix'

Conflicts:
	VTK/MultiBlockVectorFieldVTK.cxx
minor changes
add raw2vti in VTK/examples
timing the vortex computation, where the bottleneck is the Jacobian computation
jacobian (unstable)
backup
1. fix a bug in at_vertex() when referencing the vertex data given (i,j,k).  2. remove UnitJacobian since the way to do normalization may be wrong.  3. VTK integration now supports at_vert() and phy_coord()
add missing file
possible memleak when using SetField()