Handle decimals correctly even with default decimal context precision.

[LHCGreg]

This has the side effect of fixing integration test failures when testing connected_test.py by itself. getcontext().prec = 38 was run in all_test.py which gets run before connected_test.py if you are running all tests, but does not get run if you are only running tests in connected_test.py.

Fixes #90

[codecov[bot]]

Codecov Report

Merging #94 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   94.02%   94.02%   +<.01%     
==========================================
  Files          26       26              
  Lines        7818     7819       +1     
==========================================
+ Hits         7351     7352       +1     
  Misses        467      467

Impacted Files	Coverage Δ
tests/all_test.py	95.06% <ø> (-0.01%)	:arrow_down:
src/pytds/tds_types.py	92.98% <100%> (ø)	:arrow_up:
tests/connected_test.py	98.55% <100%> (ø)	:arrow_up:

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[denisenkom]

Thanks!