root2ebye can now handle root files which don't have the appropriate branches

Added a loop in main which goes through all branches in tree and searches for a: if there is a digi channel (dn) and if so b: looks if the branch name starts with HSIA. If so a class variable hsia is set.

A new function InitBranches() now handles the SetBranchAddress. It checks that the branches are in the tree before setting them with the variable hsia.