Range dim

[jgrewe]

fixes

• missing return in DimensionLink.id
• a few docstrings
• the version number in appveyor.yml
• SampledDimension.axis returned the wrong number of data points (off by 1 due to rounding issues under certain conditions)

adds

• RangeDimension.is_alias method for downward compatibility
• DataArray.append_range_dimension_using_self as a convenience method

[coveralls]

Coverage increased (+0.05%) to 79.027% when pulling a29fe7c on jgrewe:range_dim into d1a9f70 on G-Node:master.

[codecov-commenter]

Codecov Report

Merging #503 (a29fe7c) into master (d1a9f70) will increase coverage by 0.04%.
The diff coverage is 86.84%.

@@            Coverage Diff             @@
##           master     #503      +/-   ##
==========================================
+ Coverage   78.71%   78.76%   +0.04%     
==========================================
  Files          59       59              
  Lines        9278     9342      +64     
==========================================
+ Hits         7303     7358      +55     
- Misses       1975     1984       +9     

Impacted Files	Coverage Δ
nixio/dimensions.py	91.40% <74.35%> (-1.67%)	⬇️
nixio/data_array.py	91.66% <100.00%> (+0.61%)	⬆️
nixio/test/test_dimensions.py	99.75% <100.00%> (+0.01%)	⬆️

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[jgrewe]

@achilleas-k guess this is ready for review ;)

[achilleas-k]

Look good. Approved, though I have one question I'm not sure about.