remove externalbuilder
Moves id to ANode level
adding modified flag to subtree
setting id of aspectsubtree
visitor changes to only visit subtree if it has been modified
remove facetime, not needed
adding requestIDs to some methods
Merge pull request #35 from openworm/referencing_variables

adding requestIDs to some methods
fix collada and obj, was missing setmodified(true) after populating
visual tree
add setInitialize method to ISimulator to allow setting flag to false
setting id for collada and obj simulators. Sends notifyTreeUpdate() from
simulate() method, dummy updates.
Adding throws clause in the interface and string constructor for
ModelInterpreterException
Added some constructors in order to ease model tree population
Entities should also visit the aspects
fix serialization issues, adds test for deeper network
Merge pull request #36 from openworm/neuromlpopulation

Neuromlpopulation
Runtime model changes
Test fix. By default now newly created aspectsubtreenodes are marked as
true since creation=modification.
remove unnecessary comments
Subentities changes