Finish datacap tests

[ZenGround0]

Finish identifying and testing out non standard behaviors of the datacap token

Closes #543

[codecov-commenter]

Codecov Report

Merging #747 (52740bc) into master (126ad53) will increase coverage by 0.13%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #747      +/-   ##
==========================================
+ Coverage   86.60%   86.74%   +0.13%     
==========================================
  Files          95       95              
  Lines       19955    19955              
==========================================
+ Hits        17283    17310      +27     
+ Misses       2672     2645      -27     

Impacted Files	Coverage Δ
actors/datacap/src/lib.rs	55.37% <ø> (ø)
actors/init/src/lib.rs	96.77% <0.00%> (-1.62%)	⬇️
actors/power/src/lib.rs	83.89% <0.00%> (-0.22%)	⬇️
test_vm/src/lib.rs	89.42% <0.00%> (+0.11%)	⬆️
actors/miner/src/lib.rs	83.61% <0.00%> (+0.12%)	⬆️
actors/miner/src/testing.rs	92.75% <0.00%> (+0.98%)	⬆️
actors/miner/src/deadline_info.rs	96.62% <0.00%> (+16.85%)	⬆️