cds_string now has its own type.

+ Adding _ for supper classes.
+ sh script to run tests of all the modules.
adding comments.

+ array_pushnzt (pushn, memset to zero, with type)
Added heap. TODO: formal check of tree indexing.
Added heap. TODO: formal check of tree indexing.
Update on tests + fix of cds-heap
Memory failure in array now can be handled by the user.
Adding doxygen in C files to avoid poluting H.
In alphabetic order.
cds_bits + testing.
Don't explode on allocation failure.
preliminary list.
more testing cases.