Support renaming of _ to % routines

GT.M stores % routines as _{RoutineName} instead of %{RoutineName}.
Enhance PackRO.py to perform the rename if it sees _{RoutineName} to
%{RoutineName}.

Change-Id: I0fc12a55325e48bf455454d54ab2cfa37369dd25
Suggested-by: Sam.Habiel@gmail.com
OSEHRA-Id: http://issues.osehra.org/browse/OAT-128