This version has a couple important additions/changes:
1. Added VirtualFlybrain.org's VNC templates, meshes and CMTK transforms (thanks to Robbie1977): see the new `download_vfb_transforms()` function
2. Added a function to download JRC VNC H5 transforms: `download_jrc_vnc_transforms()`
3. For consistency renamed `download_saalfeld_transforms` -> `download_jrc_transforms`
4. Added a landmark-based FANC <-> MANC transform