HPCC-9977 Document "eclcc -Me" option and add to usage

Signed-off-by: JamesDeFabia <James.Defabia@LexisNexis.com>
Merge branch '9977_Document_eclcc_Me_option' into closedown-4.0.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>