Set dim label

[jgrewe]

as we discussed, this pr adds a label for SetDimensions

As this is a non-breaking change to the model the file format version is increased to 1.2.1

[codecov-commenter]

Codecov Report

Merging #522 (ad5be25) into master (724c663) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #522      +/-   ##
==========================================
+ Coverage   81.25%   81.29%   +0.04%     
==========================================
  Files          81       81              
  Lines       10538    10561      +23     
==========================================
+ Hits         8563     8586      +23     
  Misses       1975     1975              

Impacted Files	Coverage Δ
nixio/data_array.py	91.66% <100.00%> (ø)
nixio/dimensions.py	91.46% <100.00%> (+0.14%)	⬆️
nixio/file.py	88.46% <100.00%> (ø)
nixio/test/test_dimensions.py	99.54% <100.00%> (+0.01%)	⬆️

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[coveralls]

Coverage increased (+0.01%) to 79.599% when pulling 63e0e04 on jgrewe:set_dim_label into 14ccf08 on G-Node:master.

[mpsonntag]

Looks good to me.