(MESS) saturn: made RAM / Backup RAM expansion internal
slot options. you now mount these with the -cart media switch,
i.e. for instance
  mess.exe saturn -cdrm ddsom -cart ram32
or
  mess.exe saturn -cdrm draculax -cart bram16
and not anymore using the -exp option. [Fabio Priuli]

out of whatsnew: this prevents users from passing conflicting setups like
"-exp ram32 -cart kof95", etc. these would have lead to unpredictable effects,
depending on the order of the option (and whether they were set at command
line or inside ini files)