[cmake] Fix cmake python for Ubuntu 14.04

There is a bug in Ubuntu 14.04 : the interpreter
does not return the correct position of the libpython.
We add the correct path to the path hints, at the end (lowest priority).
In most machines, the first hint is the correct answer.
Fix for issue #134

There was a bug in the transpose of the indices. Added a test.
Fix issue #128

This is just cosmetics but should be fine.
Revert "Fix #128"

This reverts commit bd10dce7f1a052e4bef7697ab08a6dfa3308bfaa.
Merge remote-tracking branch 'triqs/1.2-dev' into 1.2-dev