ENH: make sure depend helper actually works, if a depend library gets updated, then the target needs to be removed, and the CONFIGURATION directory needs to be used

BUG: Libraries and executables that are built with version numbers and symlinks should be built by a rule using the real file name.  The symlink file names should be rules that just depend on the main rule.  This way if a version number changes a target will re-link with the new name and the symlinks will be updated.

ENH: Improved robustness of sharing parent pipes with children.  This ensures that the parent pipe handles are inherited by the children.  If a parent pipe handle is invalid a handle to an empty pipe is given to the child to make sure all pipes are defined for the children.