Instrumentation of overheads in atBeforeExit for ctimesimple

- NX_SHOW_CORE to show exec core or critical tasks and
- --show-original to show tasks colored according to type or criticality

To be able to differentiate graphs generated by different applications
and also graphs generated by different processes of the same application
(MPI), we have changed the name to be dependant of these parameters.

In this version, all the empty subgraphs generated for convenience
are not inserted into the final dot graph.
Also, consecutive subgraphs which are separated with a taskwait
are connected vertically to keep the execution order.

This commit also changes the name of the graph. So far it always was
"graph.dot" but now it will be "graph_BINARY_NAME.dot".

Creating ready/blocked event once the task change state; also separting semantic in between ready/blocked tasks from init/started tasks; closes #903

Fix mismatch between new and delete calls; helping valgrind to follow allocation and deallocation objects; closes #865

Nanox deb package now requires extrae. Fixed the mail address too.

Adding no-portability warning suppression in automake options, this will suppress a warning when calling $(shell ...)
RPM Package is now generated using the date and the distribution (closes #897)

Considering WD submits with depencence vector but number of dependences equal to zero. In these cases we will ignore dependence info; closes #893