Enable dumping only part of the buffer for burst writer.

[DomFijan]

Description

Adds 3 options to dump function of burst writer: start, stop and clear buffer. Start and stop determine which subset of frames will be dumped, while clear buffer flag clears the buffer or not. Default options should give same results as the current implementation.

Motivation and context

This would be very useful to have for interactivity with dupin where often we just want to dump a subset of the deque buffer of dump writer.

How has this been tested?

Tests testing new functionality have been added.

Change log

Changed:

* Add option to dump a subset of frames in burst writer
  (`#1870 <https://github.com/glotzerlab/hoomd-blue/pull/1870>`__)

Checklist:

• I have reviewed the Contributor Guidelines.
• I agree with the terms of the HOOMD-blue Contributor Agreement.
• My name is on the list of contributors (sphinx-doc/credits.rst) in the pull request source branch.

[joaander]

Thanks!