changed BTree ops to take FileSplitProvider instead of btree file name

git-svn-id: https://hyracks.googlecode.com/svn/trunk@175 123451ca-8445-de46-9d55-352943316053
19 files changed
tree: 6f738c64ef5b1b6b061942473d95a9e363ba4324
  1. hyracks/