Better implementation of the time limit

[guimarqu]

closes #377

[codecov]

Codecov Report

Base: 86.59% // Head: 86.54% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (c73fe30) compared to base (214649b).
Patch coverage: 71.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #744      +/-   ##
==========================================
- Coverage   86.59%   86.54%   -0.06%     
==========================================
  Files          59       59              
  Lines        5388     5405      +17     
==========================================
+ Hits         4666     4678      +12     
- Misses        722      727       +5     

Impacted Files	Coverage Δ
src/Algorithm/treesearch/branch_and_bound.jl	92.70% <ø> (ø)
src/Algorithm/colgen.jl	82.44% <50.00%> (-0.14%)	⬇️
src/Algorithm/utilities/helpers.jl	60.00% <50.00%> (ø)
src/Algorithm/treesearch.jl	77.77% <66.66%> (-5.56%)	⬇️
src/Algorithm/conquer.jl	80.00% <87.50%> (+0.12%)	⬆️
src/env.jl	100.00% <100.00%> (ø)

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