Changes to PrettyTables printing

[ValentinKaisermayer]

Gets rid of a lot of code so that we do not have to reinvent the wheel. Printing is a little different (tail is omitted, top and bottom hline).

closes #514
closes #428

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6db8220) 88.29% compared to head (fea5ff4) 86.30%.

❗ Current head fea5ff4 differs from pull request most recent head 76da9a2. Consider uploading reports for the commit 76da9a2 to get more accurate results

Files	Patch %	Lines
src/timearray.jl	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
- Coverage   88.29%   86.30%   -1.99%     
==========================================
  Files          12       12              
  Lines         752      672      -80     
==========================================
- Hits          664      580      -84     
- Misses         88       92       +4     

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[ValentinKaisermayer]

@iblislin Can you review this?

[iblislin]

Thanks for your contributions!