Updated header and makefile for rangetree.h

git-svn-id: file:///svn/tokudb@1746 c7de825b-a66e-492c-adef-691d508d4ae1

Added the following tests:

 * Single point overlaps
  * Tree: {|0-1|}, query of |1-2| returns |0-1|
  * Tree: {|1-2|}, query of |0-1| returns |1-2|
  * Tree: {|1-2|}, insert of of |0-1| success == allow_overlaps
  * Tree: {|0-1|}, insert of of |1-2| success == allow_overlaps
 * Complete overlaps
  * Tree: {|0-3|}, query of |1-2| returns |0-3|
  * Tree: {|1-2|}, query of |0-3| returns |1-2|
  * Tree: {|1-2|}, insert of of |0-3| success == allow_overlaps
  * Tree: {|0-3|}, insert of of |1-2| success == allow_overlaps
 * Exact overlaps
  * Tree: {|0-3|}, query of |0-3| returns |0-3|
  * Tree: {|0-3|}, insert of of |0-3| success == allow_overlaps

Also freed buf and NULLed the pointer to help find memory leaks.

git-svn-id: file:///svn/tokudb@1745 c7de825b-a66e-492c-adef-691d508d4ae1

More range tree tests.

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Additional tests for range trees.

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back to toku_rt_insert.
The error code was for insert, not delete.

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First set of test cases for range trees.
linear.c is stub implementation so we can compile and write tests before
we actually implement the range tree.

The makefiles were modified just enough to get this to work, and have to
be cleaned up a lot.

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Added header file with documentation for range trees

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rollback for 5 now runs (but the files are wrong).  Started working on a brtdump that will help debug this stuff.  Right away I see important file differences after recover (the unused memory and unnamed root are wrong). Addresses #27.

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incorrect locking.
Addresses #7

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#if defined(__APPLE__)
static pthread_mutex_t ydb_big_lock = PTHREAD_MUTEX_INITIALIZER;
#else
static pthread_mutex_t ydb_big_lock = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP;
#endif

Unsure if this does the same thing for apple.
Addresses #280

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Log and recover for note splits works a little better (recovery runs, but the file is wrong for test_log5).  Addresses #27

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