disable ROM at reset when flash jumper is set

git-svn-id: http://svn.code.sf.net/p/vice-emu/code/trunk/vice@27879 379a1393-f5fb-40a0-bcee-ef074d9b53f7
added command line option for setting flash jumper

git-svn-id: http://svn.code.sf.net/p/vice-emu/code/trunk/vice@27880 379a1393-f5fb-40a0-bcee-ef074d9b53f7
Merge remote-tracking branch 'git-svn'