Included temporary fix which removes pre-existing CPAC installs before installing new version.
Included temporary fix which removes pre-existing CPAC installs before installing new version.

sgiavasis/C-PAC,sgiavasis/C-PAC,roijo/C-PAC_complexitytools,danlurie/C-PAC,danlurie/C-PAC,danlurie/C-PAC,roijo/C-PAC_complexitytools,roijo/C-PAC_complexitytools,roijo/C-PAC_complexitytools,sgiavasis/C-PAC,sgiavasis/C-PAC,danlurie/C-PAC