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c++ interface is implemented (up to a point) and every method that can raise an exception is tested in exceptions.cpp.  Fixes #197, #215.

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Fixes a bug where I forgot to set the reallocced memory.
Addresses #42

git-svn-id: file:///svn/tokudb@1305 c7de825b-a66e-492c-adef-691d508d4ae1

DB->open, and DB->remove now use the data dirs
We look (in order) in each of the data dirs for a file to open/remove.
The first file found, is the one used (even if another is similarly named with
different subdbs).

For creating dbs, (if file does not exist in any of the search dirs), we always
create in the first data dir (or env->i->dir if no data dirs are set).

Addresses #42
Addresses #108


git-svn-id: file:///svn/tokudb@1304 c7de825b-a66e-492c-adef-691d508d4ae1

DbEnv.set_errfile

toku_db_env_err now writes to the file from set_errfile
toku_db_env_err calls toku_db_env_err_vararg

Fixed DbException.set_env, and callers of it.
Modified test1 to not use exceptions, since the test tried to use return codes.

Closes #214
Addresses #197
Addresses #215

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git-svn-id: file:///svn/tokudb@1302 c7de825b-a66e-492c-adef-691d508d4ae1

the exception class is implemented, and for db.cpp and dbenv.cpp it is called.  Still need to do exceptions for dbc.cpp dbt.cpp txn.cpp.  Addresses #215.

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DbEnv.set_data_dir, DbEnv.set_errpfx

Added tests for them.
Addresses #197

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test1 modified to test the new features.

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error codes from unlink.
Modified test_db_remove_subdb to check for this.
Closes #211

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