doc: move isl_space operations to unary/binary operations sections
doc: move isl_space operations to unary/binary operations sections

This is a continuation of the change in 4d45b72 (doc: move isl_local_space
operations to unary/binary operations sections, Tue Jan 28 14:36:14 2014 +0100).

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

UBERTC/isl,simbuerg/isl,BenzoSM/isl,BenzoSM/isl,nicolasvasilache/isl,evaautomation/isl,SaberMod/isl-current,PollyLabs/isl,nicolasvasilache/isl,Meinersbur/isl,simbuerg/isl,Distrotech/isl,SaberMod/isl-current,PollyLabs/isl,BenzoSM/isl,nicolasvasilache/isl,Distrotech/isl,Meinersbur/isl,Distrotech/isl,PollyLabs/isl,inducer/isl-mirror,KangDroidSMProject/ISL,Meinersbur/isl,BenzoSM/isl,abduld/isl,inducer/isl-mirror,tobig/isl,evaautomation/isl,evaautomation/isl,nicolasvasilache/isl,Meinersbur/isl,inducer/isl-mirror,nicolasvasilache/isl,Distrotech/isl,inducer/isl-mirror,PollyLabs/isl,abduld/isl,evaautomation/isl,BenzoSM/isl,simbuerg/isl,UBERTC/isl,SaberMod/isl-current,tobig/isl,simbuerg/isl,abduld/isl,PollyLabs/isl,SaberMod/isl-current,KangDroidSMProject/ISL,KangDroidSMProject/ISL,UBERTC/isl,UBERTC/isl,KangDroidSMProject/ISL,simbuerg/isl,tobig/isl,Distrotech/isl,inducer/isl-mirror,KangDroidSMProject/ISL,tobig/isl,abduld/isl