Fix for issue #225.

The call for setting the LDAP protocol could never work since it was run on the LDAP->m_Connection object which at that moment was still null, since the assignment of the ldap connection object happened afterwards! Moreover, added a few more checks and reports to the log file.
Update license file with current developers.
Update requirement for HuCore version.

- Version 4.5.1p1 or higher will be needed to run HRM 3.1.0.
Update translation of 'Stabilization' field  in 'possible_values' table.

- The field now states that the dataset will be stabilized "if possible". This needs to be clearly stated this way because HuCore will make a distinction between 'traditional' STED datasets and STED 3D datasets. Namely, the stabilization will be skipped at runtime if the STED 3D parameter is high enough as to generate a short PSF (in Z). Therefore, this is unknown beforehand and has to be checked at runtime.
Correct unnecessary breakline in dbupdate script.
Fix missing sted3D parameter in the report table.
Add boundary values to (STED) percentage values.
Add error messages for each STED parameter.

- The STED error messages were too general, the user could not guess which parameters were wrongly set.