Collective.multimodeview

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- Nothing changed yet.

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- Code cleanup.
[maurits]

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- the 'add_portal_message' now only displays a message if there is
one. It allows for example to set an empty success message for a
given mode. [vincent]

- added auto_process to mode. When declaring this kind of mode, the
form is automatically processed when switching to this
mode. [vincent]

- added possibility for modes to automatically redirect to another
page. [vincent]

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- added the possibility to define a custom label for the cancel button
and a custom cancel message for each mode. [vincent]

- you can now defined the modes to swtich to once form is processed or
user cancelled in the 'modes' dictionnary. [vincent]

- added samples + README. [vincent]

- extracted code from Products.plonehrm. [vincent]