[sugar] [PATCH 2/5] Add functionallity for tabbing trough activities.

[Benjamin Berg]

This commits adds some functions and properties to keep track of the
activities when the user is tabbing.
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 src/model/homemodel.py |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 61 insertions(+), 0 deletions(-)
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