[Tobago] Preparation for the releases 2.5.0, 4.5.5, 5.1.0

[Udo Schnurpfeil]

Hi, folks,

we plan to build the versions 2.5.0, 4.5.5, 5.1.0 of Tobago in the next 
days.

If you know any blocking problems with the current SNAPSHOTs, give me a
hint.

Regards,
Udo