Update shell scripts for Jenkins automated build and testing

In the new Jenkins project settings, we will have four projects to support different build/test tasks.

* The "dist" project simply creates distribution tarball that is used by the other projects.
* The "valgrind" project performs "make check" to run all test cases. They are run using Valgrind so that we can find memory management defects as well.
* The "distcheck" project performs "make distcheck" to create distribution tarballs (of all distribution types) and test the integrity of the tarballs.
* The "doxygen" project creates doxygen documentation of the main codebase.

The shell script for the old standalone project is removed.