fix: memory leaks in factorization
fix: memory leak
deleted unnecessary stuff using NTL in non-word size case
deleted more unnecessary stuff using NTL in non-word size case in univariate factorization

Conflicts:

	factory/cf_factor.cc
fix: memory leaks in sparse GCD
Merge pull request #368 from mmklee/memory

Memory
add: AUTHORS for all.lib (#498)
add: AUTHORS to tst.lib
add: dim(i,j) (#505)
format
fix: wrong computation of Groebner basis over Z/2^n
format
chg: updated test results for ringmod2m.tst
Merge pull request #384 from mmklee/groebner_rings

Groebner rings