sagelib: spkg-install
sagelib: continued
sagenb: postponing; no idea how to workaround #14840
sagetex: fix patches
scipy patch quickfix
setuptools: misc
singular: spkg-install (makefile)
singular: misc patches

- dont -I$(prefix), its pretty much nonsense
- -I../factory, as there might be headers...
- dont recreate cf_gmp.h
- dont unnecessarily touch mod2.h
- use install, not cp
- chmod *before* install
singular: fix install path for gftables
sphinx: hmmm
sympow: misc

- move patches
- note on broken spkg-install
sympow: fix patches
sqlite: patch quickfix
symmetrica: CUR
sympow: cleanup
termcap patch quickfix
sage-bin: env
sage-doc: continued
python-sage: automake workaround still needed :|
python-sage: move extension to pyxx for cplus files