Made further ITauRecTool methods const

Tomasz Boldrequested to merge
tbold/athena:tau-const-3 into master

This is a continuation of: !34996 (merged) and !34955 (merged) and earlier efforts by @mwandas to make the tau tools interface const. Tagging @xiaozhon

BTW. There is one more method: executePanTau - is that one going to be used?

Merge request reports