COLLECTION Copy collection flat with concatenated names
    
    This patch addresses several issues:
    a) Adds capability to add or copy the collections
    in flattened mode but construct names of attributes
    in dotted notation. For example when you append collection
    "sub" with items "foo" and "bar" previously you
    could add them as "foo" and "bar" not you can
    flatten them and the names will be "sub.foo"
    and "sub.bar" this allows better processing of the
    attributes in the elapi message.
    b) Removes old implemntation of the
    copy collection function.
    c) Removes the col_set_timestamp,
    this functionality has been moved to ELAPI
    long ago.
    d) Updates collection unit test.
    e) Updates elapi to use new functionality
    f) Updates elapi unit test
    Have run under valgrind with no problems.