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.

The targets are the destinations which
caller wants to send the events to.
The sinks are now on the second level
under targets and constitute a so called
fail over chain for a target.
Such approach eliminates the need for complex
routing function.
The dispatcher keeps the list of targets in a collection.
The element in the collection is the target context.
Also gispatcher keeps the list of the sinks
in a separate collection.
Each target context has a list of the sinks
associated with this target. But those are just
pointers (at least for now) to the sinks
form the list kept by dispatcher.

I had to add some internal debug callbacks
to be able to see that all the internals of
the dispatcher are actually in order.
See the conttent of config file for more comments.
Also see information posted on SSSD wiki.
https://fedorahosted.org/sssd/wiki/WikiPage/ELAPIInterface

a) Added the main logging interface which
   allows creating dispatcher and logging messages or events.
   Can't actully log anything yet since the sinks are stubbed out.
b) Made default template be a part of the default
   dispatcher.
c) Updated UNIT test.
d) Some of the calls are stubbed out but they are there
   to indicate where next round of work will be.

The remove functions extract and remove
items, they act differently from the way
the delete_property function works.
The new functions allow deletion with
the disposition while the delete_property
only deletes specified property.
The delete_property function is left as is
since there are some use cases when it is
more efficient to use it rather than new
remove_item_xxx ones.

This is just a part of the interface,
a beginning. Most likely some of the functions
will be altered but it is a starting point.
For example in future there will be
a way to override some of the parts of the
default template using the application configuration file.
Removed obfuscation of the data types based on
discussion with Simo.