Move covers to alib2algo

...go/src/stringology/cover/ApproximateCoversComputation.cpp

...algo/src/stringology/cover/ApproximateCoversComputation.h

alib2algo/src/stringology/cover/ExactCoversComputation.cpp

alib2algo/src/stringology/cover/ExactCoversComputation.h

...ingology/cover/RestrictedApproximateCoversComputation.cpp

...tringology/cover/RestrictedApproximateCoversComputation.h

...rministicApproximateSuffixAutomatonForHammingDistance.cpp

...terministicApproximateSuffixAutomatonForHammingDistance.h

...icApproximateSuffixEpsilonAutomatonForHammingDistance.cpp

...sticApproximateSuffixEpsilonAutomatonForHammingDistance.h

...rc/stringology/cover/ApproximateCoversComputationTest.cpp

.../test-src/stringology/cover/ExactCoverComputationTest.cpp

...logy/cover/RestrictedApproximateCoversComputationTest.cpp

...isticApproximateSuffixAutomatonForHammingDistanceTest.cpp