Pull feffio updates (credit: Alan Dozier).
Cleanup of feffio.
Limit error types.
Merge new changes.
Cleanup feffio_set code.
More cleanup.
Minor improvements to docs.
Fix docstrings.
v2.6.6b
Update feffio.
Update example.
Add very detailed installation instructions for all platforms.
Add change log.
Minor cleanup.
Minor cleanup of matcher.
Cleanup of README and docs.
Merge remote-tracking branch 'mpmaster/master'
 New abiobjects