Several parameter-related improvements in the serial and parallel code
- Open output file on demand (failure causes BX_ERROR)
- Simplified bochsrc options cleanup
- serial: improved parameter dependencies


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11978 6c8e4198-a580-4521-a02f-c9ae86df1db9