Merge conflicts between 1.2.13 and 1.3.1

Handle standalone code.

merge conflicts between 1.2.10 and 1.2.13

Fix all remaining typos, mainly in comments but also in few definitions and log messages, reported by me in PR kern/54889.
Also fixed some additional typos in comments, found on review of same files

Fix all remaining typos, mainly in comments but also in few definitions and log messages, reported by me in PR kern/54889.
Also fixed some additional typos in comments, found on review of same files or typos.

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merge conflicts

Fix build problems caused by crc32 addition to libkern. Also, this makes
the i386 bootblocks about 2K smaller than they were before we monkeyed
with crc32 at all.

change DEBUG to ZLIB_DEBUG.

from www.zlib.net