Enh/dtselect

[oruebel]

Motivation

This is the matching PR for hdmf-dev/hdmf#191 The selection behavior of DynamicTable and DynamicTableRegion has changed in HDMF to return Pandas DataFrames. This updates the tests in PyNWB to conform with the new changes/

Checklist

• Have you checked our Contributing document?
• Have you ensured the PR description clearly describes problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running flake8 from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using #XXX notation where XXX is the issue number?

[codecov]

Codecov Report

Merging #1106 into dev will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             dev   #1106   +/-   ##
=====================================
  Coverage   67.3%   67.3%           
=====================================
  Files         38      38           
  Lines       2288    2288           
  Branches     394     394           
=====================================
  Hits        1540    1540           
  Misses       679     679           
  Partials      69      69

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e1080cd...8f90295. Read the comment docs.