Coded the function to disregard hypernodes which do not contribute to any unification.
Added stop_watch_t, which is a class to measure time.
Revised the enumeration procedure of a_star_based_enumerator_t.
Revised lhs::a_star_based_enumerator_t to set max-distance.
Deleted the function for temporal axioms.
Added some functions related with time-out.
Commented _enumerate_hypernodes_disregarded out in proof_graph_t::post_process.
Revised the function to print errors or warnings.
Fixed a compiling error in sol::gurobi_t.
Implemented functions to insert/get unification-postponements.
Added the function to set the number of threads to gurobi.
Fixed compiling errors.
Added the function to write configuration to XMLs of output.
Added a flag "disable_reachable_matrix" to disable reachable-matrix on enumeration with depth_based_enumerator_t.
Fixed the bug related to lhs::depth_based_enumerator_t.
Fixed the bug that evidences of each node are not calculated correctly.
Revised tools/graphviz.py.
Added the function to define constraints to forbid chaining from a literal which is excused from cost payment by unification.
Added proof_graph_t::enumerate_descendant_nodes.
Implemented the function to add constraints for mutual-exclusion between unifications, in ilp::weighted_converter_t.