Issue #303: framework for reference_dense added

This commit comes from a split of the original commit whose details are as follows:
SHA1 ID: a7c1db0
Author: Albert-Jan Yzelman <[email protected]>  2022-01-14 15:52:26
Committer: Albert-Jan Yzelman <[email protected]>  2022-01-30 13:48:35

The reason for splitting is to separate the changes irrelevant to the branch 303 into a separate branch.
The split produced 3 separate commits.
This commit is number 1.
This commit in particular is relevant to 303 and will remain in it.

Issue #303: unify script argument similar to --no-reference

Issue #303: complete implementation of Vector< reference_dense >, modulo output iteration.

Issue #303: modified vector implementation according to option 3 in handling dense container construction.

Issue #303: vectors now have an iterator for the user to extract data from.

Issue #303, fixed silly oops: the difference between two iterators should be an integer

Issue #303: containers are now uninitialized on construction. Iteration over uninitialized containers returns nothing.

Issue #303: configure and cmake now properly do make install with reference_dense

Issue #303: cmake infra has updated-- make dense_reference additions compatible to it

Drafting structured matrix interface using reference_dense backend

Issue #303: Copy test mxm.cpp to dense_mxm.cpp as a starting point

Issue #303: Add partial first version of Matrix interface for denseref

Issue #303: WIP: dense mxm test

Issue #303: Add dense mxm test to CMakeLists

Issue #303: Separate reference and reference_dense includes

Issue #303: Fix grb include name mismatch

Issue #303: Add src files for reference dense backend

Issue #303: Add project related option for dense backend

Issue #303: Remove dense_reference-related code from reference cmake

Author: hidanielesgit

src/graphblas/reference/CMakeLists.txt

@@ -25,7 +25,6 @@
 assert_valid_variables( SHMEM_BACKEND_INSTALL_DIR
 	REFERENCE_BACKEND_DEFAULT_NAME REFERENCE_OMP_BACKEND_DEFAULT_NAME
 	REFERENCE_SELECTION_DEFS REFERENCE_OMP_SELECTION_DEFS
-	DENSE_BACKEND_DEFAULT_NAME DENSE_SELECTION_DEFS
 )
 
 assert_defined_variables( backend_reference_srcs )