Adds unit arguments to the priors and appends them to the corner plots

Note - also forces all `__init__` calls in `prior.py` to use key word
arguments to ease changes in the future.

test/prior_tests.py

@@ -35,7 +35,7 @@ class TestPriorInstantiationWithoutOptionalPriors(unittest.TestCase):
 
     def test_base_repr(self):
         self.prior = tupak.core.prior.Prior(name='test_name', latex_label='test_label', minimum=0, maximum=1)
-        expected_string = "Prior(name='test_name', latex_label='test_label', minimum=0, maximum=1)"
+        expected_string = "Prior(name='test_name', latex_label='test_label', unit=None, minimum=0, maximum=1)"
         self.assertEqual(expected_string, self.prior.__repr__())
 
 

tupak/core/result.py

@@ -197,7 +197,7 @@ class Result(dict):
         for k in keys:
             if k in self.search_parameter_keys:
                 idx = self.search_parameter_keys.index(k)
-                latex_labels.append(self.parameter_labels[idx])
+                latex_labels.append(self.parameter_labels_with_unit[idx])
             elif k in self.parameter_labels:
                 latex_labels.append(k)
             else:

tupak/core/sampler.py

@@ -192,6 +192,9 @@ class Sampler(object):
         result.parameter_labels = [
             self.priors[k].latex_label for k in
             self.__search_parameter_keys]
+        result.parameter_labels_with_unit = [
+            self.priors[k].latex_label_with_unit for k in
+            self.__search_parameter_keys]
         result.label = self.label
         result.outdir = self.outdir
         result.kwargs = self.kwargs