changed data type for _n_subdivisions to avoid two implicitcasts with potential loss of information
Merge pull request #546 from rinkk/ImplicitCastFix

Data type change in Subdivision
Better prerequisite checking for coverage reports.
Disabled long running tests, introduced new make target ctest-large.
Enabled xUnit report generation on CTest targets.
[ML] Const correction, variable locality.
[ML] Replace throw with assert in DenseMatrix::op().
[MeL] Implement NodeAdjacencyTable.
[MeL] Add setMatrixSparsity.
[PL] GW: Use node adjacency table.
[MeL] Document Node::setConnectedNodes().
[MeL] Rewrite and enable setNodesConnectedByElements().

The rewrite gives factor 3 speedup.
[MeL] Use nodes' connectivity information.

Adjacency information is already computed for
each node; transform to ids in createTable().
[MeL] Remove unnecessary adjacency degree hint.
Merge remote-tracking branch 'endJ/DenseMatrixOptimizations' into develop
Merge remote-tracking branch 'endJ/NodeAdjacencyTable' into develop
[BL] Start CPUTime and RunTime timers at creation.
[PL] GW: Time solve().
Timing and memory scripts.
Logog level ALL.