Changes from 2.1.1 to 2.1.2

When retrieving a row of a 1-dimensional array, a 0-dim array was returned instead of a numpy scalar. Now, an actuall numpy scalar is returned. Closes #222.
LZO and bzip2 filters adapted to an API fix introduced in HDF5 1.8.3. Closes #225.
Unsupported HDF5 types in attributes are no longer transferred during copies. A new _v_unimplemented list have been added in AttributeSet class so as to keep track of such attributes. Closes #240.
LZO binaries have disappeared from the GnuWin32 repository. Until they come eventually back, they have been put at http://www.pytables.org/download/lzo-win. This has been documented in the install chapter.

Solved problems with Table.modifyColumn() when the column(s) is multidimensional. Fixes #228.
The row attribute of a table seems stalled after a table move or rename. Fixes #224.
Fixed a problem with len(array) in 32-bit platforms when array is large enough (> 2**31).
Added missing _c_classId attribute to the UnImplemented class. ptrepack no longer chokes while copying Unimplemented classes.
The FIELD_* sys attrs are no longer copied when the PYTABLES_SYS_ATTRS parameter is set to false.
The FILTERS attribute should not be written when PYTABLES_SYS_ATTR parameter is set to false.
Disable the printing of Unicode characters that cannot be printed on win32 platform. Fixes #235.