mos6502
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corrections to flags
solid65 is picking up some mistakes with overflow calculations; here is one lot of fixes.
Apparently the change causes a regression test to fail; I am going to do more research before I determine whether the change is wrong (and the converse bug is present in some other emulators) or the regression test is wrong. This will involve adding perfect6502 (or probably a derivative) to the solid65 fuzztesting suite.
Thanks for looking into that. Good work so far.