POWER FAILURE: workareasmanager.cpp must be created again....
IMPORTANT: moved workareas storing in workareas folder

--this way the workareasmanager which is going to be
responsible for the workareas data engine has been decoupled
from the workareas storing system. The workareas storing
system will be moved to the data engine.
fixes bug off crashing kde when updates workareas names

--when a workarea is added in greater length than the
desktops one
fixes #60, it must be tested to be sure