Made READ_BYTE etc. safe with respect to a changing input. e.g., READ_BYTE(a++);
change dosdebug and disassembler code to use integer addresses.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1916 7758b857-130e-0410-ab9c-d8735a528d18