add a small readme with developer help. Due to that separate better the widget groups.

git-svn-id: svn+ssh://controls01/siciliarep/svn/trunk/tango_client/ctlinac/trunk@13208 a18efa20-c439-0410-bf20-9b91ec695b4c
include the new attribute with the cooling loops status history as a dock widget with a TaurusValuesTable.

git-svn-id: svn+ssh://controls01/siciliarep/svn/trunk/tango_client/ctlinac/trunk@13209 a18efa20-c439-0410-bf20-9b91ec695b4c