Added script to launch all the unit tests.

tests/runalldseriestests.m

+opath = path();
+
+% Check that the m-unit-tests module is available.
+try
+    initialize_unit_tests_toolbox;
+catch
+    urlwrite('https://github.com/DynareTeam/m-unit-tests/archive/master.zip','master.zip');
+    warning('off','MATLAB:MKDIR:DirectoryExists')
+    mkdir('../externals')
+    warning('on','MATLAB:MKDIR:DirectoryExists')
+    unzip('master.zip','../externals')
+    delete('master.zip')
+    addpath([pwd() '/../externals/m-unit-tests-master/src'])
+    initialize_unit_tests_toolbox;
+end
+
+% Initialize the dseries module
+try
+    initialize_dseries_toolbox;
+catch
+    unit_tests_root = strrep(which('runalldseriestests'),'runalldseriestests.m','');
+    addpath([unit_tests_root '/../src']);
+    initialize_dseries_toolbox;
+end
+
+run_unitary_tests_in_directory(dseries_src_root);
+
+delete('*.log');
+rmdir('../externals/m-unit-tests-master','s');
+path(opath);
\ No newline at end of file