Updated info.py for maintenance branch
NF: add script to build dmgs from buildbot mpkgs

Needs sudo, needs to be run on OSX.  Please ask me (Matthew) for an
account if you need to run this and don't have a Mac to hand.
TST - added test for dipy_fit_tensor script
RF - have dipy_fit_tensor use TensorModel instead of Tensor
RF - Take dti.Tensor out of dipy in favor of dti.TensorModel
RF - use sum/mean in dipy.reconst.dti
Merge remote-tracking branch 'upstream-ro/maint/0.6.x' into main-master

Merge -s ours version change commit from maintenance branch to allow pull
changes up from that branch by merging.

* upstream-ro/maint/0.6.x:
  Updated info.py for maintenance branch
DOC: more updates to release notes

Add merge -s ours instructions for maintenance branch.

Add reminder to do pyx file doctests.
RF: refactor pyx / c file stamping for packaging

Yarik was finding it annoying to have the stamping procedure inside the
sdist procedure, so pull it out so we can use it to build and stamp
pyx and c files in the source tree.
Merge pull request #163 from MrBago/remove_dti_Tensor

Remove dti tensor
Calculation for mode of a tensor
Updated Tensor Mode calculation for n-dimensional array
Cleaned up tests and typos
Doc reference fixes
RF: Rewrite of the tensor mode calculation with no loops.

Also, broke it down into separate functions, added some testing, etc.
Latex squiggle on A for Tensor Mode docs
DOCS + PEP8
RF: got the terms mixed up a bit.
RF: Rebased from master
Removed somehow duplicated code