Fixes #3517 : Now handle exception when the lock file is already taken.
Fixes  #3639 : correct disable/enable css buttons
Fixes #3612 : Clearer logs when dynamic updates
Merge pull request #230 from VinceMacBuche/bug_3639/search_form_buttons_stay_disabled

Fixes  #3639 : correct disable/enable css buttons
Merge pull request #228 from VinceMacBuche/bug_3517/Handle_error_node_deletion

Fixes #3517 : Now handle exception when the lock file is already taken.
Merge pull request #231 from VinceMacBuche/bug_3612/dyn_update_log

Fixes #3612 : Clearer logs when dynamic updates
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5

Conflicts:
	rudder-core/src/main/scala/com/normation/rudder/batch/UpdateDynamicGroups.scala
	rudder-core/src/main/scala/com/normation/rudder/services/servers/RemoveNodeService.scala
	rudder-web/src/main/scala/com/normation/rudder/web/services/DisplayNode.scala
Merge branch 'branches/rudder/2.5' into branches/rudder/2.6

Conflicts:
	rudder-web/src/main/scala/com/normation/rudder/web/services/DisplayNode.scala