a4atlas: Add proper initialisation of PAUCaloIsolationTool
Revert "Merge pull request #194 from pwaller/root2a4-move"

This reverts commit ae281c2e7ea117b66d6936d0b2210a3b5bb1e805, reversing
changes made to 899982408579e8f829cc9fabafaefe40590f292d.

The move introduced a double copy of EventMetaData.proto and EventStreamInfo.proto,
which leads to a protobuf error message if both a4atlas and a4root are loaded.