Delocate

Make compatible with latest Xcode error messages.

Fix broken tests from 0.7.0.

Add ability to deal with rpath. Thanks to Kyle Stewart.

More changes for compatibility with newer OSX Xcode messages. Thanks to
Sean Gillies.

- more adaptations to changes to output of `otool`.

Changes for compatibility with newer OSX. Thanks to Tommy Sparber.

- adapt to SIP file protections;
- adapt to changes in otool output;
- rebuild testing wheels for OSX 10.6 compatibility.

- Inspect all files looking for linked libraries, instead of inspecting only
files ending in library extensions. This means that you will also pick up
libraries for executables in the given path to delocate, by default, but
is slower to execute. Thanks to Marc Abramowitz for the report and
suggestion;
- Remove silly check for library existence when delocating libraries that
are in the tree to delocate.