Previously, only the SSSD server components were being built with
compile-time warnings enabled. This patch will ensure that all
components in common and sss_client are also built the same way.

There was a static global structure used in iteration and in
traversing the collection. It has been removed and replaced with
a better solution.

Fix consts and function declarations

See ticket #37 in sssd track.

Patch prepends prefix "col_" to all
functions related to collection.
This caused some formatiing issues
so the alignement was addressed too.

Adds a unit test for deletion and re-adding
of the elements to collection.
Small syntactical fix in "stack".

Patch adds two interfaces for stack and queue using
collection as underlaying implementation.
It also fixes a bug in the insterion code -
the unsigned properties were created as long.

This patch adds formatting changes to
better follow the style guidelines in
the collection unit test.
No logical changes to the code.
I was planning to do it for a while
per Simo's comment when he accepted
the core of the collection code but
indicated that the unit test should be
cleaned later.
Later has come.

Add was always insterting at the end of the collection.
With this change one can control where the item is
inserted and deal with the duplicates too.
Also one now can extract items from collection
using absolute and relative disposition.
Using more advanced hashing function.

If automake 1.11 or higher is available, use of the configure
option '--enable-silent-rules' will suppress most build messages
and replace them with lines such as
CC   sysdb.o

This affects libtool as well.