Revert "Reduce "error" logging in regression testing (only WARN and above)"

This reverts commit 5127d38.

Turns out we DON'T want these things ending up in the Annotations, which they will if printed to stdout

Author: rwest

rmgpy/tools/regression.py

@@ -230,8 +230,6 @@ def configure_logging():
 
 def main():
     "Returns the list of variables that failed the regression."
-    configure_logging()
-
     input_file, benchmark, tested = parse_command_line_arguments()
 
     args = read_input_file(input_file)  # casetitle, observables, setups, tol