Clean out some dead code.
Add --skip option: By default, mutilate tries to maintain a long-term QPS average by issuing requests as quickly as possible until it catches up with where it 'ought' to be.  If you give the --skip option, it will instead just skip sending requests that are already late.
Minor beautification.
--skip: pass option with options_t to agents
Change --skip behavior to only jump ahead if the tx time is at least 5ms (hardcoded for now) behind.  Always pacing with timer events was causing it to severely miss QPS targets...
Updated sync_agent() to be less ridiculous.  Still ridiculous, though.