Vimpdb

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- Nothing changed yet.

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- fix highlighting of current line.

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- tests cleanup : get rid of helper class and functions.

- code cleanup : improve imports style.

- code cleanup : use ``vim_bridge`` to bridge VIM script and python.

- after ``c(ontinue)``, key mapping was broken (again :-().

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- fix Linux default values in documentation.

- document ``PDBxx`` commands.

- less noise on VIM command-line.

- better highlighting of current line.

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- fix launch of VIM server when server names collide like VIM and GVIM.

- fix detection of VIM support.

- fix **vimpdb** buffer creation.

- fix and tune Linux default values.

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- ``PDBEval`` (mapped to ``?`` key) to ask for a Python expression to evaluate.

- ``PDBClear`` (mapped to ``B`` key) to clear a previously set breakpoint.

- open new tab only if there is already an opened file in VIM.

- close **vimpdb** buffer when ``continue`` (``c``), ``reset`` (``x``) or quit
(``q``).

- launch VIM server also if another server is running.