BigFloat improvements

[nsajko]

See the commit messages of the two commits

[nsajko]

The errors seem to be related to MOI and unrelated to these changes.

[odow]

You can comment out the failing tests for now: https://github.com/ds4dm/Tulip.jl/pull/137

[nsajko]

Locally all tests pass with the changes in #137

[nsajko]

Added the compat entry for MA to Project.toml and fixed a typo in a commit message.

[codecov-commenter]

Codecov Report

Merging #136 (9bbe799) into master (a0032b5) will increase coverage by 0.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   89.02%   89.18%   +0.16%     
==========================================
  Files          43       44       +1     
  Lines        2751     2783      +32     
==========================================
+ Hits         2449     2482      +33     
+ Misses        302      301       -1     

Impacted Files	Coverage Δ
src/IPM/HSD/HSD.jl	87.50% <100.00%> (+0.19%)	:arrow_up:
src/IPM/HSD/dot_for_mutable.jl	100.00% <100.00%> (ø)
src/IPM/HSD/step.jl	94.80% <100.00%> (+0.06%)	:arrow_up:
src/Tulip.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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