Minor correction in docs.
Fix a typo. Tidy up the description of statgrab_init a bit. Update the list of supported platforms.
Replace duplicated code for dropping privileges with a library function that always drops setuid/setgid privileges.
Added doc's for statgrab_init
Add a central page statgrab(3) which links all the functions together. Add a link in the See Also section of each manual page back to the central one.
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