Fixed gfanlib/polymake handling scripts in the build system

add: also added a minor compiler flag and other minor changes to BS
Merge branch 'spielwiese' of github.com:Singular/Sources into spielwiese
fix: pLength in completeReduceFac (from master)
fix: tr. #669 (minAssChar)
fix: tr. #670 (intvec(int,intvec))
fix: changing isHomog for 0-module in prune
doc: reference attrib -> killattrib
doc: lll_lib -> LLL
doc: syntax fixes
Merge branch 'spielwiese' of github.com:Singular/Sources into spielwiese