Resolve now-ambiguous trait bounts in non-autoconvert code.

[iliekturtles]

autoconvert code fixed in 2f6d6c8.
Resolves #234, #210.

[codecov-io]

Codecov Report

Merging #235 (252370d) into master (0e597dd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #235   +/-   ##
=======================================
  Coverage   96.72%   96.72%           
=======================================
  Files          57       57           
  Lines        2691     2691           
=======================================
  Hits         2603     2603           
  Misses         88       88           

Impacted Files	Coverage Δ
src/si/mod.rs	100.00% <ø> (ø)
src/system.rs	83.78% <ø> (ø)

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