bitmap fix for current

[Mike Stump <mikestump at comcast dot net>]

I was doing a merge, and it failed to even compile the runtime libraries due to checking in bitmap.  bitmap goes to remove set bits from the bitmap (the second hunk in a two hunk set), and it fails to update the current pointer.  That memory is freed and then reallocated and a new index is put into it, and then we fail a consistency check later on due to the mismatch between head->index and head->current->indx, because current was not properly maintained.  This patch removes the old value of current when we remove what it points to from the bitmap.

Ok?

Attachment: bitmap.diffs.txt
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