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.
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 #160 from matthew-brett/dmg-build-script

NF: add script to build dmgs from buildbot mpkgs
Merge pull request #167 from matthew-brett/merge-maint

Merge maint
Merge pull request #168 from matthew-brett/more-release-notes

DOC: more updates to release notes
Merge pull request #169 from matthew-brett/refactor-pyx-stamps

RF: refactor pyx / c file stamping for packaging
Updated index.rst and refactored example segment_quickbundles.py
Merge pull request #172 from Garyfallidis/website_after_0.6_release

DOC: Updated index.rst and refactored example segment_quickbundles.py
RF: use $PYTHON variable for python invocation

As Yarick kindly suggested.
Merge pull request #174 from matthew-brett/python-variable-in-makefile

RF: use $PYTHON variable for python invocation