#2 Sequence diagram layout fix

[Anonymous]

This patch fixes the sequence diagram layout behavior:
* Activation bar nodes never overlap
* Activation bars on separate lifelines are laid out independently unless there is a connecting call

The patch is made against CVS sources as of 12/29/2007.

[Nobody/Anonymous]

Fixes sequence diagrams layout

[SnakE]

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The patch is mine. Forgot to login. Sorry.