fix: do not set minpoly to 0 (in poly.lib)
fix: div for int division

from master
add: example Makefile
chg: tag stuff for doc, example Makefile
fix: surfex.lib: no_ex (requires interactive surfex)
fix: memory leak in intvec::String

from master
fix: more memory leaks (analogue intvec::String)

from master
Merge branch 'spielwiese' of https://github.com/Singular/Sources into Tests
Removed the modifications in dyn_modules and copied the original .stat files