Tdf-extensionuploadcenter

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- Change fallback email sender and recipient from hard coded to the variable
site email address [Andreas Mantke]
- Remove redundant source code [Andreas Mantke]
- Update localization template and German translation and Spanish
localization file [Andreas Mantke]

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- Add a new email form to send feedback to a project author with recaptcha
protection and link it from the project and the smallproject
view [Andreas Mantke]
- Pep8 fixes [Andreas Mantke]
- Update localization template, Spanish localization file and German
localization [Andreas Mantke]

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- Add a missing entry for small extension projects in the search for newest
projects [Andreas Mantke]
- CSS fix [Andreas Mantke]
- Structure the eupproject edit mode with register [Andreas Mantke]
- Update German localization [Andreas Mantke]
- Improve the edit dialog and split it into more register for the release and
the linked release module. [Andreas Mantke]

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- Improve the view and the search features of the eupcenter and include the new
module for smalll projects in the search and listing [Andreas Mantke]
- Add the install instructions to the ressources of the new module for small
projects view [Andreas Mantke]

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- Add a new module for small extension projects [Andreas Mantke]
- New function to search and display categories for extension
projects and small extension projects [Andreas Mantke]
- Update German localization [Andreas Mantke]

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- CSS fix [Andreas Mantke]
- PEP8 fixes [Andreas Mantke]
- Change over to supermodel.directives for primary fields and fieldsets [Andreas Mantke]
- Change from plone.directives form.mode to plone.autoform directives.mode [Andreas Mantke]