Bug fix for jalib::Filesystem::DirName()

- When a string of format /xxx is passed, return "/".
[Fix provided by Robin Staes.]

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1959 ba6dc0ae-232f-0410-883f-9ebac64fc565
Added --tmpdir to dmtcp_restart_script.sh

[Fix supplied by Robin Staes]

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1960 ba6dc0ae-232f-0410-883f-9ebac64fc565
Some compiler warnings fixed.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1961 ba6dc0ae-232f-0410-883f-9ebac64fc565
Pass --with-plugin argument to ssh child.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1962 ba6dc0ae-232f-0410-883f-9ebac64fc565
Adding plugin-tutorial.pdf w/ boldface (FIX THIS LATER.)


git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1963 ba6dc0ae-232f-0410-883f-9ebac64fc565
Removed empty directories.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1964 ba6dc0ae-232f-0410-883f-9ebac64fc565
MTCP: Fix test_use_compression (gzip now works)

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@1965 ba6dc0ae-232f-0410-883f-9ebac64fc565