Delete all executables

aconversions/src/fa2re/afa2re.brzozowski.cpp

aconversions/src/fa2re/afa2re.elimination.cpp

aconversions/src/fa2rg/afa2lrg.cpp

aconversions/src/fa2rg/afa2rg.cpp

aconversions/src/fa2rg/afa2rrg.cpp

aconversions/src/re2fa/are2fa.brzozowski.cpp

aconversions/src/re2fa/are2fa.glushkov.cpp

aconversions/src/re2fa/are2fa.thompson.cpp

aconversions/src/rg2fa/alrg2fa.cpp

aconversions/src/rg2fa/arg2fa.cpp

aconversions/src/rg2fa/arrg2fa.cpp