Add CMIS storage support.

[fmerges]

The following changes add support for CMIS.

There is a particular case which doesn't work with the current version of cmislib 0.5.1 unless patched, see: https://issues.apache.org/jira/browse/CMIS-799

The case consists of writing to a file with subfolders that doesn't exists in the remote repository. Example:

filename = '/folder/subfolder/some_text.txt'    # new file doesn't exist yet remotely
with storage.open(filename, 'w') as f:
    f.write(u'Hello World!\n')

In order to make it work you just have to apply the following diff to cmislib.model.py:

2912c2912
< return ResultSet(self._cmisClient, self, result)
—
> return ResultSet(self._cmisClient, self._repository, result)

[jpvanhal]

Thanks! I'll try to review this over the weekend.

[mehcode]

For whats it worth we have a python 3.x only version of cmislib here: https://github.com/concordusapps/python-cmislib

We migrated it in a hurry a good while back.

[fmerges]

Your link is a fork of jpots unreleased version https://github.com/apache/chemistry-cmislib right?

A made this taking the released one which is 0.5.1

I wonder what happen with it because I don't see much activity on the official page, I filed a bug report but nothing happened so far... to me it's curious because there are quite some companies that rely on Alfresco and others...

[Fiveside]

The python3 fork was made 6 months ago with whatever was on the subversion trunk at the time (the converter left some weird branches in the git version that I haven't bothered to clean up yet). As far as I can tell, no new changes have been pushed to cmislib in the time since then.