Convention for error (>0) and warning (<0) codes

• 0 : no errors and warnings
• 50 : module not initialized
• 100 : wrong input
• 110 : could not find requested reaction
• 120 : double fit is requested for reaction described by a single fit
• 130 : single fit is requested for reaction described by a double fit
• -100 : wrong input, corrected
• 200 : memory allocation problem
• -200 : memory deallocation problem
• 300 : problem while reading file
• 310 : input file is not found
• -300 : problem while writing file
• 400 : internal problem
• -400 : ...

Todo:

1. An option to load only selected reactions (like in EIRENE)
2. MPI broadcast