Increase Project sharing limit beyond 100

Increase the current limit of "100 shares" for a given project. Exceeding that limit produces an error for the Project Manager.

In some cases, for bigger projects, the Project Manager needs to share the project to more than 100 individuals. I do not understand where the 100 came from (seems like an odd, low number), but I would like to see it increased to something like 500 or 1000.