Fix some BDOS and CCP issues. #200
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… This avoids issues where the current drive according to the BDOS doesn't match the current drive according to the BIOS, which can make odd things happen.
…selected, it's that the user programs are changing drive when they shouldn't be --- specifically, the CPP was changing drive to the argument of DIR. Fix this.
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This avoids issues where the current drive according to the BDOS doesn't match the current drive according to the CCP, which can make odd things happen.
Fixes: #151
Fixes: #113
Previously it would just keep searching up off the end of the bitmap and trying to write to out-of-bound blocks.
Fixes: #170