* Clean up align_to_8byte!
* small clean up
* Strictly sanitize mmapped AppendVec files
* Clean up
* Fix typo
* Rename align_to_8byte => u64_align
* Fix typo
* Clean up unsafe into methods of StoredAccount
* Made oddness more apparent
* Yet more clarification
* Promote a PR comment into a src comment
* Fix typo...
* Move ref_executable_byte out of tests impl