The ph.x should be parallelized by setting in the input parameters
`start_irr` and `last_irr` to 0. This allows the program to exit
smoothly and it further avoids to wait for the rewriting of the
wavefunctions, which can be a rather long and intensive IO
operation, not really suited for initialization runs.

The parser is then adjusted to account for this option, as for some
reason the line having `JOB DONE` is not printed in such cases.
A simple specialized parser is also added to store the number of
q-points and their values, which can be later on used to parallelize
over q-points by specifying `last_q` and `start_q`.