package.py : extra arguments, fixed inheritance issue

- added attribute to hold extra arguments in PackageBase instances
- fixed registration from within packages
- examples : hdf5, lzo

var/spack/repos/builtin/packages/lzo/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Lzo(Package):
+class Lzo(AutotoolsPackage):
     """Real-time data compression library"""
 
     homepage = 'https://www.oberhumer.com/opensource/lzo/'
@@ -37,13 +37,13 @@ class Lzo(Package):
     version('2.06', '95380bd4081f85ef08c5209f4107e9f8')
     version('2.05', 'c67cda5fa191bab761c7cb06fe091e36')
 
-    def install(self, spec, prefix):
-        configure_args = [
-            '--prefix={0}'.format(prefix),
+    def configure_args(self):
+        return [
             '--disable-dependency-tracking',
             '--enable-shared'
         ]
-        configure(*configure_args)
-        make()
-        make('check')
-        make('install')
+
+    @AutotoolsPackage.sanity_check('build')
+    def check(self):
+        if self.extra_args.get('build-tests', False):
+            make('check')