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
singular file to patch path fix
singular: adapt spkg-install, checksums to broken tarball
singular: remove already applied patches
singular: sanitize sanitize_gmp_header_hack
singular
singular: move patches
Merge branches 'pyxx' and 'gmp_mpir' into toplevel-WIP
Merge branch 'doc_src' into toplevel-WIP

Conflicts:
	src/bin/sage
Merge branch 'singular' into toplevel-WIP2

Conflicts:
	pkgs/singular/patches/Minor.h.patch (deleted)
python-sage: Makefiles update for 512beta4
CXX fix (needs work)
linbox: remove extra/broken CFLAGS env
move git package into place
get rid of transition files

- src/bin/install-sh
- src/bin/sage-dist-install
- src/bin/sage-dist-make
toplevel register ncurses foreign package
toplevel: move package description out of /build

"build" will be used to build packages.

move autotools package
sage-bin: cleanup env

- adapt env
- remove sage-arch-env
- remove SAGE_ROOT hacks
- remove ECLDIR (ecl takes care of it)