Implement signed columns for users and groups.

Fixes #475.
Towards simple table generation
Simple template functions
Organize /tools
Amalgamate generated tables
Use a single class for Table plugins
Merge pull request #510 from wxsBSD/issue_475

Implement signed columns for users and groups.
Merge pull request #515 from theopolis/faster_generator

Towards simple table generation
Codemod to improve include search paths
Merge pull request #518 from theopolis/better_includes

Codemod to improve include search paths
Codemod to improve include search paths for includes
Merge pull request #519 from theopolis/better_includes2

Codemod to improve include search paths for includes
Add -s flag to OSX package script
Merge pull request #522 from theopolis/make_pkg_simple

Add -s flag to OSX package script