Updating the scons scripts.

Adding two aliases to the scons command: 'python' and 'tests'
Need to test those scripts on GNU/Linux and Windows. Validated on OSX.

SConstruct

@@ -43,7 +43,7 @@ vars.Add('PLUGIN_LIB',        'Special links for ALTA plugin')
 vars.Add('EIGEN_INC',         'Eigen include directory (mandatory)')
 vars.Add('PYTHON_INC',        'Python and boost-python include directory')
 vars.Add('PYTHON_DIR',        'Python and boost-python libraries directory')
-vars.Add('PYTHON_LIB',        'Python and boost-python libraries directory', default=[])
+vars.Add('PYTHON_LIB',        'Python and boost-python libraries', default = [])
 vars.Add('OPENEXR_INC',       'OpenEXR include directory', default=[])
 vars.Add('OPENEXR_LIB',       'OpenEXR libraries', default = [])
 vars.Add('OPENEXR_DIR',       'OpenEXR libraries directory',default=[])
@@ -188,12 +188,16 @@ external = env.SConscript('external/SConscript')
 core     = env.SConscript('sources/core/SConscript')
 plugins  = env.SConscript('sources/plugins/SConscript')
 softs    = env.SConscript('sources/softs/SConscript')
-#python   = env.SConscript('sources/python/SConscript')
-#tests    = env.SConscript('sources/tests/SConscript')
-#env.SConscript(dirs=['sources/core', 'sources/softs', 'sources/plugins'])
+
+if 'python' in COMMAND_LINE_TARGETS:
+	python = env.SConscript('sources/python/SConscript')
+	env.Depends(python, core)
+
+if 'tests' in COMMAND_LINE_TARGETS:
+	tests = env.SConscript('sources/tests/SConscript')
+	env.Depends(tests, core)
 
 env.Depends(plugins, core)
 env.Depends(softs, core)
 #env.Depends(python, core)
-#env.Depends(tests, core)
 #env.NoClean(external)

sources/python/SConscript

@@ -23,7 +23,7 @@ if library_available(env, pkgspec='python-2.7',
 if build_lib:
 	env.Prepend(LIBS = ['core'])
 	env['SHLIBPREFIX']=''
-	env.SharedLibrary('../build/alta.so', ['alta.cpp'])
+	env.Alias('python', env.SharedLibrary('../build/alta.so', ['alta.cpp']))
 else:
 	print "<<ERROR>> Unable to build the Python interface, please install boost-python"
 	print "          or check your configuration."

sources/tests/SConscript

@@ -4,5 +4,5 @@ env = env.Clone()
 env.Prepend(LIBS = ['core'])
 env.AppendUnique(LIBS = ALTA_LIBS)
 
-env.Program('./build/half-test-1', './params/half-test-1.cpp')
-env.Program('./build/half-test-2', './params/half-test-2.cpp')
+env.Alias('tests', env.Program('./build/half-test-1', './params/half-test-1.cpp'))
+env.Alias('tests', env.Program('./build/half-test-2', './params/half-test-2.cpp'))