Makes use simpler. The setools submodules map 1:1 to classes anyway;
the separate modules are simply to ease organization.
Change seinfo to use conditional setter use rather than conditional
instantiation of queries. Note: pylint disable is added because pylint
gets confused by the reuse of the q variable and thinks that q is always
BoolQuery, so it incorrectly reports missing member functions.
Group all exception classes into a module for each package. This is the
first step towards having all exceptions raised by setools libs be a child of
SEToolsException.
The main graph is never rebuilt since the perm map never changes. This
mirrors how a user might interact. If in the future perm map changes
are introduced, the code should still cope.
Also one minor efficiency tweak in InfoFlowAnalysis. Don't bother removing
edges due to weight if it is set to 1 since that includes everything.
Infoflow now will create a complete graph for the policy and then create
a subgraph to filter out nodes based on excluded types and edges based on
minimum weight. The main graph will only need to be rebuilt if there is
a change in the permission map. While this is a little more expensive for
seinfoflow, it should make interactive analysis in apol faster since
repeatedly deriving a subgraph will be faster than repeatedly rebuilding
the entire graph.
