Simplify do-user-admin code.
Simplify do-user-admin code.

Previously had php code to remove a user from project and slices,
now use modify_project_members from the pa which calls chapi python
code that will remove a user and reinstate the project lead as owner
of a slice if that user owned slices.

tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal