Fix warning for template methods used from bamboo.treefunctions
Fix #54 (closed)
The problem is that for template methods it's hard to get the return type from ROOT (for non-template methods it's in the documentation), the safest workaround is passing it explicity (done in this PR for all those that are inserted by bamboo.treefunctions).
Unrelated: a one-line fix to allow passing several sbatch_additionalOptions
through the envConfig file.