change internal release versioning to 1397xx for alpha

So this means
* 14.0 Alpha1:   139701
* 14.0 Beta1:     139801
* 14.0 RC1:       139901
* 14.0 final:        140000
* 14.1 final:        141000

This could be extended to the textual versioning that we use now. ( 14.0alpha1 )