Debug print statement left in post-process production code

[sbryngelson]

Bug

In `src/post_process/m_data_input.f90`, a bare `print *, q_cons_vf(i)%sf(:, 0, 0)` statement dumps raw conservative variable data to stdout during every post-processing run.

File: `src/post_process/m_data_input.f90`, line 315

Impact: Floods stdout with unformatted array data during post-processing, cluttering output and slowing I/O. On multi-rank runs, output from all ranks interleaves.

Severity: High — debug output left in production code path.

[sbryngelson]

Fix: #1184