diskmap implemented. bitmap extended. diskmap_bootstrap call added to main.c
added diskmap_selftest. tested diskmap; works
Added read_page and some of write_page to coremap.c, and then had as_copy and vm_fault call read_page
Merged debugged coremap into addrspace
Finished merging and moved read_page/write_page to diskmap after erroneously placing them in coremap
Fixed read_page and write_page, and changed diskmap to use ints instead of longs
merged from addrspace
Merge branch 'coremap' into addrspace
Deleted a leftover merge thing.
Merge branch 'addrspace' into coremap