[ci skip] add v_drag and test through ppisn pulses

Author: Debraheem

star/dev_cases_test_TDC/dev_TDC_through_ppisn/README.rst

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+.. _ppisn:
+
+*****
+ppisn
+*****
+
+This test case evolves a very massive helium star from the He-ZAMS
+up to the ocurrence of a pulsational pair-instability event (see |Marchant2019|).
+
+.. |Marchant2019| replace:: `Marchant et al. 2019 <https://ui.adsabs.harvard.edu/abs/2019ApJ...882...36M/abstract>`__
+
+Initialization of the model
+===========================
+The initial mass of the helium star is set in ``inlist_extra``
+
+.. literalinclude:: ../../../star/test_suite/ppisn/inlist_extra
+
+In this case we use a :math:`72 M_\odot`
+
+Last-Updated: 2019-11-12 (mesa r12413) by Pablo Marchant
+

star/dev_cases_test_TDC/dev_TDC_through_ppisn/README_DEV

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+Test cases with names beginning in "DEV_" are under development.
+This means that they are not ready for consideration by general users as a "how to" guide for research to be published.
+
+Play but don't publish!
+
+The situation is similar to that for options in controls_dev.defaults and star_job_dev.defaults.
+

star/dev_cases_test_TDC/dev_TDC_through_ppisn/ck

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+#!/bin/bash
+
+# this provides the definition of check_one
+# check_one
+source "${MESA_DIR}/star/test_suite/test_suite_helpers"
+
+check_one

star/dev_cases_test_TDC/dev_TDC_through_ppisn/clean

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+#!/bin/bash
+
+cd make
+make clean