Add topics (diary entries) tied to activities?

[andrewcooke]

Currently there is no way to associated diary data directly with an activity. The underlying problem is how to re-associate data when the activity is reloaded. This could be solved somehow and would allow things like titles for activities that persist across version updates.

[andrewcooke]

plan of attack:

• add activity topic classes
• separate instance generation from topic journal (populate etc)
• make diary journal date based
• integrate activity topics
• separate front end so we can have web based

[andrewcooke]

implemented in 0.28