Fix 428e9dad72e79ae8c396f6b50cd0b3f13b0f202d.

copied dict was completely replacing current dict, so _partition_id and _computer_id were deleted.
Fix broken test introduced in 30a3eec6c8162d9174168e4e7d22d389d8db9020.
Implement access token to ease computer creation.

Allow to query the web site without copy/pasting the user SSL certificates.
The query should be like:
curl -X POST -H "X-Access-Token: ACCESSTOKENVALUE" -d "title=COMPUTERTITLE" "https://slaposmaster.example.org/add-a-server/WebSection_registerNewComputer"

Access token is destroyed after usage.
The token validity is one day.
Update slapos-client.cfg.
English.

Grammar nazi strikes back.
Support non ASCII character in slaptool.

xml_marshaller requires unicode string.
Merge branch 'master' into cliff