Added some fixes for wrappers when:
- Vertical-horizontal: Is working again.
- Partition parameter: Was giving some crashes in the horizontal wrapper
- Processor-per-node: Not defining it or giving a value inferior to jobs total_cores used was crashing the wrapper
- Node-list file generated in wrappers has now a random_alphanumeric string to avoid extremely rare race issues when multiple wrappers are running simultaneously. Also, it is now deleted when is no longer needed.
Redesigned wrapper doc page