main
[man pages] tweak cache_check manpage.
[man pages] fix some formatting issues with the new man pages.
[man] Fix man page formatting
[man] Fix the buffer size descriptions for cache_writeback
[man pages] Don't refer to the non-existant era_repair.
[man pages] Add missing argument to era_invalidate
[thin_check] rename --fix-metadata-leaks to --auto-repair
[manpages] Rewrite man pages in a simpler text format.
[man] Update thin_dump man page
[man] Update man page for thin_ls
[man] Update thin_migrate man page
Add some ftests, and fixup whitespace from Nikhil's work
[thin_trim] remove all mention of --pool-inactive from man page.