#1347 configuration parsing format string bug and buffer overflow

[Seth Arnold]

Hello, two issues in parsing configuration files were reported to the Ubuntu bug tracker by MSVR on behalf of Jeremy Brown (jerbrown) of ReSP: https://bugs.launchpad.net/ubuntu/+source/bochs/+bug/1313194

The first is a format-string bug in parsing at least the floppya field.

The second is a stack corruption bug in parsing at least the romimage field.

Thanks

[Volker Ruppert]

I have applied some fixes to SVN now. Please check if everything is okay now.