singular: remove already applied patches
singular: sanitize sanitize_gmp_header_hack
ntl: fix again
python-sage. fix stdint.pxd
python-sage Makefiles
python-sage: Makefiles
python-sage: bsc

- __init__.py target moved to common
python sage s/libgap.so/libsagegap.so/
sagelib: spkg bugfix
toplevel build system continued