Proposal of interface change in skel liblary.

This commit is maily to identifi and document problem.  Intoroduced solution will need some additional changes to the previously "fixed" skeletons.
New interface for `seq` skeleton.

The interface is given as a possibility, and is not included in the tests suite since for now there are no properietis that should be implemented.
New interface of pipe skeleton.
New interface in org skeleton.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons.
New interface in recomp skeleton.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons. Additionaly all skelton requariments are handled in skeleton make function, wich increase fun readability.
New interface in map skeleton.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons. Additionaly all skelton requariments are handled in skeleton make function, wich increase fun readability.
New interface in reduce skeleton.

First example of skeleton that does not take one workflow as argument.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons. Additionaly all skelton requariments are handled in skeleton make function, wich increase fun readability.
New interface in feedback skeleton.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons.  Additionaly all skelton requariments are handled in skeleton make function, wich increase fun readability.

Atom naming shows that feedback works similar to while loop.
New interface in farm skeleton.

Changed tree element tuple to two element one.  This should improve readbility and fit interface of future skeletons. Additionaly all skelton requariments are handled in skeleton make function, wich increase fun readability.

Since farm was used in more than one place, changes in additional places were introduced.
REFATORING: more readable function call