No need for handle argument in set_value methods.

[willrogers]

Handle must always be pytac.SP in these methods.

[codecov]

Codecov Report

Merging #120 (3836922) into master (12a43dd) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
- Coverage   99.45%   99.45%   -0.01%     
==========================================
  Files          11       11              
  Lines         735      729       -6     
==========================================
- Hits          731      725       -6     
  Misses          4        4              

Impacted Files	Coverage Δ
pytac/data_source.py	100.00% <100.00%> (ø)
pytac/element.py	98.97% <100.00%> (ø)
pytac/lattice.py	99.44% <100.00%> (-0.02%)	⬇️

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