re-organize source hierachy

re-organize source hierachy

data/src was a bit odd, and git is good enough to resolve such things
for history (blame) or applying patches, so don't bother enduring
this.

The process was basically:

 git mv data/src/ data/pmxcfs
 git mv data/ src
 git mv cpgtest.c src/test
 git mv src/cts/* src/test/scripts

And a few Makefile fixups.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>