Unify exception types

[franzpoeschel]

This PR:

1. Removes ParseError from Error.hpp. It's a leftover from Parsing logic: fail gracefully on unexpected input #1237 that I ended up not using.
2. Uses error::OperationUnsupportedInBackend instead of unsupported_data_error and removes unsupported_data_error (only used in ADIOS1 implementation)
3. Puts no_such_attribute_error into Error.hpp, moves it into the error namespace as error::NoSuchAttribute, creates a compatibility alias for it and creates a Python binding for it.

Fix #1354.

[ax3l]

Thx! :)