Fix/homogeneization

[psolyca]

Another batch of renaming as sometimes I am lost on names between station trading, station to station or region to region. Thus, most of :

• station trading begin with sst or it is explicit that it is station trade
• station hauling begin with s2s or it is explicit that it is station haul
• region hauling begin with r2r or it is explicit that it is region haul
• common hauling begin with hauling
• common names are kept