Collective.documentgenerator

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- Added custom temporary directory 'CUSTOM_TMP' environment variable
for appy's workspace.
[odelaere]
- Added ability to use an external server process for LibreOffice.
[odelaere]
- Make `DocumentGeneratorLinksViewlet.get_links_info` return also the
`pod_template object` in addition to `pod_template UID`.
[gbastien]

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- Pass parameters `helper_view` and `pod_template` to
`DocumentGenerationView.get_base_generation_context` so it is available
if necessary.
[gbastien]
- Display every POD templates that implement IConfigurablePODTemplate in the
`collective.documentgenerator.ExistingPODTemplate` vocabulary.
[gbastien]
- Moved files CHANGES.rst, README.rst and CONTRIBUTORS.rst from docs/ to root.
[gbastien]

----------------

- Ordered generation links by position in parent.
[sgeulette]

----------------

- Made style not mandatory.
[sgeulette]
- Added collective.fingerpointing support to know who generated which document in which format
[odelaere]

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- On a Pod template, when displaying Pod templates that are using my odt_file,
display the absolute_url next to the title.
[gbastien]

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- Do not break if not allowed to remove tmp file, this is the case for example
when LibreOffice user is not same as Zope instance user.
[gbastien]
- Allow to override portal types and the displayed title in the list of templates to merge.
[odelaere]
- Added generation context as parameter to mailing_list
[sgeulette]
- Avoid calling mailing_list 2 times in MailingLoopPersistentDocumentGenerationView
[sgeulette]
- Added update_oo_config function to update oo option following environment variable
[sgeulette]