Get rid of default base transforms

[markus-hinsche]

Resolves https://github.com/kbressem/trainlib/issues/44

Changes:

• remove default base transforms in transforms.py
• Adjust both configs in this file

Note: configs in other code bases (other than this repo) have to be adapted by respective authors after merging this

[kbressem]

Can you also bumb the version as this is a breaking change? Maybe also add what else has been changed since 0.1 (I'll help)