Documentation: the project leaders should give examples of how things are to be documented. High quality documentation is absolutely mandatory, so documentation should introduce the topic, and give careful reference for the provided functions. The priority is to provide reference documentation for each function. It is not necessary to provide tutorial documentation.
Use free software, such as GNU Plotutils, to produce the graphs in the manual.
Some of the graphs have been made with gnuplot which is not truly free (or GNU) software, and some have been made with proprietary programs. These should be replaced with output from GNU plotutils.