add command-line option to override injection rate
add command-line option to override injection rate

git-svn-id: c9a369146f666b9deda0c4af3838c8001dc825a8@1719 ce7aba0d-9f81-40a6-a495-cecae84b0515

SyedAbubakar/BookSim,booksim/booksim2,invisibleboy/mysim,SyedAbubakar/BookSim,invisibleboy/mysim,SyedAbubakar/BookSim,invisibleboy/mysim,booksim/booksim2,booksim/booksim2