Revert "got rid of unneeded includes"

This reverts commit 3ae0224672a143e37b148cca1e3453343dcfdc48.
Merge branch 'master' of github.com:vhwanger/monolithic_pr2_planner
Merge pull request #3 from sid24ss/master

Added a cost multiplier to the abstract heuristic with corresponding get...
starting to add planner stats
Merge branch 'master' of https://github.com/vhwanger/monolithic_pr2_planner
added stats. turned OFF visualizations for now.
Merge branch 'master' of github.com:vhwanger/monolithic_pr2_planner
Implemented 2DBfs.