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Make most non-class functions static

Closed Alex Henrie requested to merge alex.henrie/graph-tool:static into master

These changes decrease the total size of the graph-tool libraries by 1.4 MB.

Before:

$ du -h `find -name *.so` | sort -h
20K     ./src/graph/draw/.libs/libgt_pycairo_aux.so
1.4M    ./src/graph/util/.libs/libgraph_tool_util.so
2.0M    ./src/graph/clustering/.libs/libgraph_tool_clustering.so
2.4M    ./src/graph/stats/.libs/libgraph_tool_stats.so
6.2M    ./src/graph/draw/.libs/libgraph_tool_draw.so
9.1M    ./src/graph/flow/.libs/libgraph_tool_flow.so
13M     ./src/graph/centrality/.libs/libgraph_tool_centrality.so
13M     ./src/graph/dynamics/.libs/libgraph_tool_dynamics.so
18M     ./src/graph/layout/.libs/libgraph_tool_layout.so
18M     ./src/graph/spectral/.libs/libgraph_tool_spectral.so
25M     ./src/graph/search/.libs/libgraph_tool_search.so
29M     ./src/graph/generation/.libs/libgraph_tool_generation.so
42M     ./src/graph/correlations/.libs/libgraph_tool_correlations.so
60M     ./src/graph/.libs/libgraph_tool_core.so
70M     ./src/graph/topology/.libs/libgraph_tool_topology.so
372M    ./src/graph/inference/.libs/libgraph_tool_inference.so

After:

$ du -h `find -name *.so` | sort -h
20K     ./src/graph/draw/.libs/libgt_pycairo_aux.so
1.4M    ./src/graph/util/.libs/libgraph_tool_util.so
1.8M    ./src/graph/clustering/.libs/libgraph_tool_clustering.so
2.3M    ./src/graph/stats/.libs/libgraph_tool_stats.so
6.1M    ./src/graph/draw/.libs/libgraph_tool_draw.so
9.1M    ./src/graph/flow/.libs/libgraph_tool_flow.so
13M     ./src/graph/centrality/.libs/libgraph_tool_centrality.so
13M     ./src/graph/dynamics/.libs/libgraph_tool_dynamics.so
17M     ./src/graph/spectral/.libs/libgraph_tool_spectral.so
18M     ./src/graph/layout/.libs/libgraph_tool_layout.so
25M     ./src/graph/search/.libs/libgraph_tool_search.so
29M     ./src/graph/generation/.libs/libgraph_tool_generation.so
42M     ./src/graph/correlations/.libs/libgraph_tool_correlations.so
60M     ./src/graph/.libs/libgraph_tool_core.so
70M     ./src/graph/topology/.libs/libgraph_tool_topology.so
372M    ./src/graph/inference/.libs/libgraph_tool_inference.so

I refrained from making any functions static that might be referenced in multiple compilation units.

Edited by Alex Henrie