Switched the physical memory allocator to a bitmap table. Previously,

page allocations were recorded by marking entries in the dummy page
tables 'flow' and 'fupp'. This approach was not very memory efficient,
since 4-bytes were used to record each page.

Now, a bitmap table is used, where every bit represents a page (every
byte therefore representing 8 pages). This approach also shaves some CPU
time during allocation, since 8 pages can be checked at a time by
testing whole bytes.

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