Unify Tonel format

[JanBliznicenko]

Pharo 12 generates Tonel 3.0, Pharo 11 generates Tonel 1.0.

Whenever any part of a class is changed in Pharo 12, the format of the entire is rewritten to Tonel 3.0, making quite a noise in commits. The format should be unified in a single commit. Either by forcing update to Tonel 3.0, or specifying that Tonel 1.0 should be kept.

Moving to Tonel 3.0 might be preferrable as it is better compatible with GemStone and both versions are compatible.