fix: assign of derived newstructs
chg: use imagemagick instead of xv for display
chg: debug message: also for proc outside of libs
chg: restart nanosleep when interrupted by signal
chg: announce Primdec::sep
Merge pull request #430 from steenpass/nanosleep

chg: restart nanosleep when interrupted by signal
fix: wait may be undefined
fix: oldpolymake.lib depends on polymake.so -> cannot be part of all.lib
chg: defer shutdown in slClose()
Merge pull request #432 from steenpass/slClose

chg: defer shutdown in slClose()
chg: divisors.lib without computations (depends on polymake.so)
fix: all.lib without tropical.lib (depends on polymake.so)
chg: singularsurf/surf/display instead of gtk-surf
install singularsurf
chg: do another waitpid() after nanosleep() succeeded
Merge pull request #434 from steenpass/waitpid

chg: do another waitpid() after nanosleep() succeeded
fix: return NULL for non-bb-types (op2: 1st OR 2nd op is of bb type)
fix: ring dep. stuff in newstruct: send/receive via links (ssi:6)
fix: ring dep. stuff in newstruct: send/receive via links (ssi:6)
fix: setting of slSetRing to slSetRingDummy