Arrange visit dropdown in chronological order

[tdwils]

This addresses #154 .

This was happening when two or more non-ADSL datasets were loaded (e.g., ADSL, plus ADEG and ADVS). The visits needed to be sorted by AVISITN.

New output:

Example study 1:

Example study 2:

[codecov[bot]]

Codecov Report

Merging #165 (c9923f9) into devel (8478cc6) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##            devel     #165      +/-   ##
==========================================
- Coverage   19.82%   19.81%   -0.01%     
==========================================
  Files          50       50              
  Lines        4500     4501       +1     
==========================================
  Hits          892      892              
- Misses       3608     3609       +1     

Impacted Files	Coverage Δ
R/mod_tableGen.R	0.00% <0.00%> (ø)

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