Introduce project parent notion

Change-Id: Ia37223afbc8bb882734abe47f365f13f10c53e18
add table to store parent/child relationship

Change-Id: I76a07730e4806499aa5abb9211b450c29168ed18
Add parent project field

Change-Id: Iaaa9f1896d562baa27919b09a3159334b466a558
adding dao methods to deal with project parent and children

Change-Id: Ib7547574e3a9a8dd3c570c6ebbe367ceaea909dd
adding new methods for CRUD

Change-Id: I37af9b859c18fee3feb89c6fecec23e335bc0e87
as a child, i can set and see my parent

Change-Id: I6f2f79ca453109f16f4949d793cbf456396e181f
allowing to remove parent in UI

Change-Id: I480e97cfe80cb38a61652419d18156561a37c822
adding project hierarchy and forbiding cycles

Change-Id: Iec8c7e6a3a2ce8da10d018d0e186d21013b6257e
adding list of children in UI

Change-Id: I6dd1d375a3b5706d4cc1bd2b96f7678fd6e9816e
Add link to hierarchy administration
Add link to parent project

Change-Id: Iadf4e1ffc27dd9309c577e96c376eb28f37d5484
Better distinguish hierarchy administration area

Link to hierarchy administration of children
when we are admin of them

Change-Id: I51c80ed6081597c18a084f877a2807166159d0e7
Add documentation/warnings about the feature

Change-Id: Id9e14e754eea5be0ecff9e108750d58e54683130
renaming HierarchyFactory to manager

Change-Id: I544a93a1c9b841c6098ed24d6afe62f9e529a048
Merge remote-tracking branch 'gerrit/3632_define_project_as_parent' into tuleap-stable-master

* gerrit/3632_define_project_as_parent:
  renaming HierarchyFactory to manager
  Add documentation/warnings about the feature
  Better distinguish hierarchy administration area
  Add link to hierarchy administration Add link to parent project
  adding list of children in UI
  adding project hierarchy and forbiding cycles
  allowing to remove parent in UI
  as a child, i can set and see my parent
  adding new methods for CRUD
  adding dao methods to deal with project parent and children
  Add parent project field
  add table to store parent/child relationship
  Introduce project parent notion

Change-Id: I6aed533be27519d94d9d9a9bd3027beff562593a
Tuleap 6.1.99.16

Change-Id: I8c1c52ae009af8fb0e02a20acce5436a7f4702cb