Hedgehog-pyvisa

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- New properties of SerialInstrument explained.
- Added many further properties to SerialInstrument.

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- Renamed timeout parameter in open() to open_timeout.
- Renamed Timeout parameter in open() to open_timeout.
- Added section about SerialInstrument.
- Added class SerialInstrument. Made termination characters even more robust.

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- Renamed TypeError to VisaTypeError.
- Added InvalidBinaryFormat. Renamed TypeError to VisaTypeError.
- Added a lot of docstrings. Fixed bug with ValueError exception raising.
- Eliminated string exceptions. A little bit of code clean-up.
- Added old distutils inclusion for RPM that cause trouble with my setuptools
installation.
- Set default for term_chars to None and implemented it in write() method.
- Described new default for term_chars.
- Added instrument(). Fixed bugs in __repr()__.
- Improved documentation.
- Switched from distutils to setuptools.

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- Changed package name to "PyVISA".
- visa_attributes.py: 0xFFFFFFFF -> 0xFFFFFFFFL.
- Switched from distutils to setuptools.

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- Added filename selection for VISA DLL with Windows in vpp43.py.
- Added code to skip over header before binary data.
- Cleaned up whitespace.
- Added support for endianess in case of binary transfers.
- Improved binary reading; now it also accepts things like "267...".

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- Changed default termination characters to "" for GPIB instruments. LF and CR
are completely stripped from the end of read string, no matter how the
termination characters are set.