added lab6
fixed minor bug in Transaction
modified TransactionTest systemtest so that it flushes all pages on commit -- this way students can still pass this before before they have implemented recovery
changed Transaction.java back!
Merge branch 'master' of https://github.com/michaelghay/cosc460
lab6
Merge pull request #44 from lyeary/master

merge please lab
Merge pull request #18 from farahfouladi/master

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