have namespace CTX)

causes problems with some compilers.

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Associate mesh vertices primarily with GEntities that represent chains. Otherwise two overlapping n-dim GEntities with common mesh vertex (and no n-1-dim GEntity at the vertex) will have some vertex ownership issues. This prevents crashes when remeshing after homology computation.

This reverts commit 7c5e27d86cab09231e1c90c6a7b19bd3db9689b1.

This reverts commit e97813c4f20e55cf0d68aa2bebb8f9eef55c6822.

This reverts commit 3249dda29efa3c98251cf6eea5ab034e26533c17.

This reverts commit 8424ab68891819ce3e5f475a729d2c0f0466994b.

This reverts commit 8020a5306e9a39725e67700c91ba92f11638f759.

This reverts commit ed1df8e16addb6b42cd1ccb620732a7d1c0426ed.

This reverts commit f0b485f576eb7df6399e38d42a3ca69b9b044110.

This reverts commit 55b9435a12d5cd16d51ce1f0426fb8fb643a41f6.