Add is_strongly_connected and number_strongly_connected_components methods #1400
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In #1399 I documented the connection methods and realized I could not find the
is_strongly_connected
andnumber_strong_connected_components
methods anywhere in the code.Since
is_weakly_connected
method looks like just checking the result ofweakly_connected_components
, I tried my luck and cloned it foris_strongly_connected
for code, docs, and tests. The same fornumber_strongly_connected_components
.