Particle properties

[brisvag]

Simple change that makes PropertyBlock more specific (now a dataframe) and introduces a metadata dict for ParticleBlocks.

[codecov-io]

Codecov Report

Merging #65 (bb34142) into develop (2c1d7ed) will increase coverage by 13.77%. The diff coverage is 91.07%.

@@             Coverage Diff              @@
##           develop      #65       +/-   ##
============================================
+ Coverage    54.74%   68.51%   +13.77%     
============================================
  Files           58       85       +27     
  Lines         1233     1639      +406     
============================================
+ Hits           675     1123      +448     
+ Misses         558      516       -42     

Impacted Files	Coverage Δ
...pingtom/core/datablocks/_tests/test_dipoleblock.py	100.00% <ø> (ø)
...epingtom/core/datablocks/_tests/test_imageblock.py	100.00% <ø> (ø)
...eepingtom/core/datablocks/_tests/test_lineblock.py	100.00% <ø> (ø)
...eepingtom/core/datablocks/_tests/test_meshblock.py	100.00% <ø> (ø)
...om/core/datablocks/_tests/test_orientationblock.py	100.00% <ø> (ø)
...ngtom/core/datablocks/_tests/test_particleblock.py	100.00% <ø> (ø)
...epingtom/core/datablocks/_tests/test_pointblock.py	100.00% <ø> (ø)
peepingtom/core/datablocks/orientationblock.py	70.90% <ø> (+3.63%)	:arrow_up:
peepingtom/entry_points/peep.py	0.00% <0.00%> (ø)
peepingtom/analysis/particles.py	88.88% <66.66%> (ø)
... and 59 more

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[brisvag]

I added a tiny bit more info in docstrings.

Yes, all the shenanigans you mentioned work just fine, because we have a very solid base SimpleBlock class that takes care of that :D

[alisterburt]

perfecto, let's go!!