Add a remove button that will allow removing parts.

Suggested by Frederf @ http://forum.kerbalspaceprogram.com/showthread.php/31760-0-20-25May-TAC-Part-Lister?p=394016&viewfull=1#post394016

The use case is:
A part got stuck inside another, and you cannot select the part to move it or get rid of it.

Until now I used another mod for this.
Offer this solution:
girka2k@2b55bdb

no, this is better:

girka2k@78444b9