[IMP-dev] IMP build directory

Copying the headers to the build/include directory and then building against the copies is problematic since they debugger will step you through the code in those copies rather than the actual header. Then if you change the file the debugger points you to your changes won't get committed and will get lost whenever someone happens to touch the original file, which could be quite a bit of time later, making it hard to remember the fix.

It would be much better to either just leave the headers in a central include directory (and, if you want to enforce permissions, enforce them on a per directory basis), or create links instead (although this might complicate installation?).