LDCad shadow (snapping) update

[Jaco van der Molen]

Hello all,

I've finally finished adding snap/mirror information to the 1901 library.

Still have to process 1902 though 

Download:
http://www.melkert.net/action/download/shadow.sf
And replace the one which came with 1.6c (close the program first)
Which is located in the seeds subfolder at the same place as the main executable.

Some QA would be appreciated especially concerning mirroring, as I tend to forget about that.

Thanks! I will see if I can test some things.