rethinking the python wrapper (#511)

* renames certain function parameter declarations and removes double pointer call from the deleteproject function

* deprecates conditonal compilation, removes python-specific headers and function renaming

* fixes tests and docs

* fixes test

tests/test_demand.cpp

@@ -46,7 +46,7 @@ BOOST_AUTO_TEST_CASE(test_categories_save)
 
     error = EN_close(ph);
     BOOST_REQUIRE(error == 0);
-    error = EN_deleteproject(&ph);
+    error = EN_deleteproject(ph);
     BOOST_REQUIRE(error == 0);
 }
 
@@ -78,7 +78,7 @@ BOOST_AUTO_TEST_CASE(test_categories_reopen, * boost::unit_test::depends_on("tes
 
     error = EN_close(ph);
     BOOST_REQUIRE(error == 0);
-    error = EN_deleteproject(&ph);
+    error = EN_deleteproject(ph);
     BOOST_REQUIRE(error == 0);
 }
 
@@ -106,10 +106,10 @@ BOOST_FIXTURE_TEST_CASE(test_adddemand, FixtureSingleNode)
 
     error = EN_adddemand(ph, node_qhut, 1.0, "TertiaryPattern", "TertiaryDemand");
     BOOST_CHECK(error == 0);
-    
+
     error = EN_getnumdemands(ph, node_qhut, &nD1);
     BOOST_REQUIRE(error == 0);
-    
+
     error = EN_getdemandindex(ph, node_qhut, "TertiaryDemand", &Dindex);
     BOOST_CHECK(error == 0);
     BOOST_CHECK(Dindex == nD1);