Replaced simulated BITOP code by non-self-modifying code, adding the used
change_bit and find_bit_r inline functions to bitops.h. Some more long->int
conversions for 64bit compatibility.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1608 7758b857-130e-0410-ab9c-d8735a528d18