Merge pull request #12 from u-c-l/readstrategies

The most advanced read strategy evaaaaar....
Merge pull request #13 from u-c-l/readstrategies

Add SendVarReadFirstLinger strategy to flags.
Fix bug in SendVarReadFirstLinger when user is following nobody
Oops: add prefix to SelectSendAllPromotion
Test skeleton.
Test improvements.
Introduce MockRepairer.
Give up zfarm_test package to allow more tests.
Read strategy tests complete.