Update `TimeSeries` handling of absolute times

[vhirtham]

Changes

Addresses the issues mentioned in #471

Related Issues

Closes #471

Checks

• [x] updated CHANGELOG.rst
• [x] updated tests
• [x] updated doc/
• [x] update example/tutorial notebooks
• [x] update manifest file

[github-actions[bot]]

Test Results

2 185 tests  +31   2 184 :heavy_check_mark: +30   3m 34s :stopwatch: -26s        1 suites ±  0          1 :zzz: +  1         1 files   ±  0          0 :x: ±  0 

Results for commit 3b03955f. ± Comparison against base commit 2245e0e9.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

Merging #791 (3b03955) into master (2245e0e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #791   +/-   ##
=======================================
  Coverage   96.87%   96.87%           
=======================================
  Files          88       88           
  Lines        6019     6025    +6     
=======================================
+ Hits         5831     5837    +6     
  Misses        188      188           

Impacted Files	Coverage Δ
weldx/core.py	93.45% <100.00%> (+0.04%)	:arrow_up:
weldx/time.py	97.78% <100.00%> (+0.01%)	:arrow_up:

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