Filename changes, and updating some doc files
- mtcp_check_vdso.c -> mtcp_check_vdso.ic
- tlsinfo.[ch] -> restore_libc.[ch]
- mtcp_restart.c : additional comments on algorithm
- some doc files updated


git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2618 ba6dc0ae-232f-0410-883f-9ebac64fc565