recurse on Proxy objects

[ajtritt]

Motivation

Link resolution on read was breaking. This was exposed by using the same ElectrodeTableRegion in multiple places. The bug was presenting itself with the following error:

AttributeError: 'Proxy' object has no attribute 'name'

Fix #558
Fix #568

[bendichter]

Looks great, thanks! I tested this on both cases and confirms that it works. Also thanks for adding comments!

[codecov]

Codecov Report

Merging #575 into dev will increase coverage by 2.37%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev     #575      +/-   ##
=========================================
+ Coverage   74.4%   76.77%   +2.37%     
=========================================
  Files         59       59              
  Lines       6334     6335       +1     
  Branches    1252     1253       +1     
=========================================
+ Hits        4713     4864     +151     
+ Misses      1268     1137     -131     
+ Partials     353      334      -19

Impacted Files	Coverage Δ
src/pynwb/form/build/map.py	79.08% <100%> (+5.83%)	⬆️
src/pynwb/form/utils.py	88.42% <0%> (-0.36%)	⬇️
src/pynwb/core.py	72.4% <0%> (+0.2%)	⬆️
src/pynwb/form/spec/spec.py	80.26% <0%> (+0.29%)	⬆️
src/pynwb/form/container.py	84.48% <0%> (+1.72%)	⬆️
src/pynwb/base.py	97.87% <0%> (+2.12%)	⬆️
src/pynwb/form/build/builders.py	90.4% <0%> (+2.8%)	⬆️
src/pynwb/file.py	91.04% <0%> (+2.98%)	⬆️
src/pynwb/form/backends/hdf5/h5tools.py	74.91% <0%> (+9.16%)	⬆️
... and 4 more

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