test-slave-instance-deployment: Replace hardcoded develop egg by local development trick.
Move unstable software to unstable folder

  All software releases which are consider unstable and not mantained were
 moved to "unstable" folder. This folder is aims to be the place for tests,
 experimentation, personal releases which are not updated or tested for long
 term support.
Missing to remove
specify patch files directly in parts using slapos.recipe.cmmi.
cleanup [versions].
add a missing rpath to self in nettle.
version up : gnutls-3.2.16.
version up : git 2.1.0.
version up : bash 4.3.

also build with our own ncurses instead of system termcap library.
Merge remote-tracking branch 'origin/master' into erp5-cluster