Add release notes (TIDINGS.rst).

TIDINGS.rst

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+====================
+  Lena release 0.1
+====================
+
+Lena v0.1 was released on April 12-13, 2020.
+
+What's new
+----------
+
+- Lena added to PyPI.
+- Adds tutorial part 2 (Split).
+
+- lena.context changes::
+
+    - lena.context.update_recursively accepts a string as *other* argument.
+    - Adds lena.context.difference.
+    - Adds a parameter *level* to lena.context.intersection.
+
+- lena.core changes::
+
+    - FillCompute can be explicitly cast from FillRequest.
+    - Adds *reset* method and keyword argument to FillRequest.
+    - FillInto adapter now has a keyword *explicit*.
+    - Adds *copy_buf* parameter to Split.
+    - Adds LenaZeroDivisionError.
+
+- lena.flow changes::
+
+    - Adds lena.flow.Zip.
+    - Adds lena.flow.get_data_context.
+
+- lena.math changes::
+
+    - Adds lena.math.Sum.
+    - Adds parameter *pass_on_empty* to Mean.
+
+- Adds performance measurements to tutorial/2_split/
+- Adds performance optimizations.
+- Adds *timeout* parameter to PDFToPNG.
+- Adds *reset* method and *make_bins* keyword argument to Histogram.
+- Adds example data files to tutorial.
+- Adds multiple tests, license and documentation.
+
+Bug fixes
+---------
+
+- Fixes setup.py.
+- Fixes Graph and its documentation.
+- Fixes lena.context.intersection.
+
+Deprecations and backward incompatible changes
+----------------------------------------------
+
+- Makes lena.flow.Print a *Call* element (not *Run*).
+- Removes lena.run (unused).
+- Removes *rescale_value* kwarg from Graph.
+
+- lena.context changes::
+
+    - Renames str_to_context to str_to_dict, adds that to documentation.
+    - Undocuments several context functions (probably unuseful).
+
+- lena.math changes::
+
+    - Numpy histogram no longer has a compute method.
+    - lena.math.Mean now raises LenaZeroDivisionError instead of LenaRuntimeError.
+
+- lena.output changes::
+
+    - Removes 'repeat' from RenderLaTeX. Makes Template and Environment private.
+    - If data has *to_csv* method, that must support kwargs *separator* and *header*.
+    - Creates ToCSV. Deprecates HistToCSV.