Improve synchronization of initTrustTreeWithoutCommit():
- This should only be used in functions which create an own identity so it has to be contained in a larger synchronization block on WebOfTrust anyway
- All callers already meet this requirement.
Improve synchronization of computeScoreValue():
- This should only be used in functions which act upon more than one score so they will need a larger synchronization block on WebOfTrust anyway
- All callers already meet this requirement.