Log message:
1.2.3:
- support Python 2.6
- several corrections
- quote empty strings to avoid graphviz errors

Log message:
update to pydot-1.2.2

# `pydot` changelog

## 1.2.0 (2016-07-01)

- Python 3 compatibility
- bumped dependency to `pyparsing >= 2.1.4`
- tests running on Travis CI
- tests require `chardet`
- detect character encoding for most test files
  using the package `chardet`

API:

- on all operating systems, search GraphViz
  executables in environment `$PATH`,
  using `subprocess.Popen`.
  No paths hard-coded due to security and privacy issues.

- add option to pass GraphViz executable name
  or absolute path as `prog` to `pydot.Dot.write_*` methods.
  This provides an alternative to
  adding GraphViz to the `$PATH`.

- the functions:
    - `pydot.graph_from_dot_data`
    - `pydot.graph_from_dot_file`
    - `dot_parser.parse_dot_data`
  changed to always return a `list` of graphs,
  instead of behaving differently for singletons.

- require that the user explicitly give an encoding to
  the function `pydot.graph_from_dot_file`,
  with default encoding same as `io.open`.

- decode to unicode at program boundaries, and
  treat binary images as bytes,
  for more compatibility with python 3.
  Use `io.open`, instead of the built-in `open`.

- rm function `pydot.set_graphviz_executables`

- rm attribute `pydot.Dot.progs`

## 1.1.0 (2016-05-23)

- compatibility with `pyparsing >= 1.5.7`

API:

- `pydot.Graph.to_string`: hide `subgraph` keyword only if so requested
- produce `warnings.warn` if `pydot.dot_parser` fails to import,
  instead of `print`

## 1.0.29 (2016-05-16)

- Maintenance release that keeps the same API
- pin `pyparsing == 1.5.7`
- update version number in source code
- update `setup.py`

Log message:
Remove python33: adapt all packages that refer to it.

Log message:
Extend PYTHON_VERSIONS_INCOMPATIBLE to 35

Log message:
Add SHA512 digests for distfiles for graphics category

Problems found with existing digests:
	Package fotoxx distfile fotoxx-14.03.1.tar.gz
	ac2033f87de2c23941261f7c50160cddf872c110 [recorded]
	118e98a8cc0414676b3c4d37b8df407c28a1407c [calculated]
	Package ploticus-examples distfile ploticus-2.00/plnode200.tar.gz
	34274a03d0c41fae5690633663e3d4114b9d7a6d [recorded]
	da39a3ee5e6b4b0d3255bfef95601890afd80709 [calculated]

Problems found locating distfiles:
	Package AfterShotPro: missing distfile AfterShotPro-1.1.0.30/AfterShotPro_i386.deb
	Package pgraf: missing distfile pgraf-20010131.tar.gz
	Package qvplay: missing distfile qvplay-0.95.tar.gz

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Mark packages that are not ready for python-3.3 also not ready for 3.4,
until proven otherwise.

Log message:
Readd py-dot package in proper dir.