Extend the int32 limits

Fix some issues with the allocations when using int32.

changed milestone to %1.1.1

requested review from @ramet

assigned to @faverge

added 81 commits

• cbe666b5...09d35cf0 - 78 commits from branch solverstack:master
• 5cb6cba8 - int32: switch some integer to size_t to avoid integer overflow
• 10e61781 - spmBase: Fix the test for validity of the matrix
• 01e2badf - ChangeLog: Add release 1.1.1

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mentioned in commit dbe17163