Add zenodo 0.5.2 entry (#1598)

- zenodo entry for v0.5.2
- minor formatting update to spack file

doc/index.rst

@@ -38,8 +38,8 @@ The Arbor software can be cited by version via Zenodo or via Arbors introductory
 Latest version
     |zlatest|
 
-Version 0.5
-    |z05|
+Version 0.5.2
+    |z052|
 
     .. code-block:: latex
 
@@ -91,6 +91,9 @@ Introductory paper
 .. |zlatest| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.1459678.svg
     :target: https://doi.org/10.5281/zenodo.1459678
 
+.. |z052| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.5031633.svg
+    :target: https://doi.org/10.5281/zenodo.5031633
+
 .. |z05| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.4428108.svg
     :target: https://doi.org/10.5281/zenodo.4428108
 

spack/package.py

@@ -73,7 +73,9 @@ class Arbor(CMakePackage, CudaPackage):
 
         # query spack for the architecture-specific compiler flags set by its wrapper
         args.append('-DARB_ARCH=none')
-        opt_flags = self.spec.target.optimization_flags(self.spec.compiler.name, self.spec.compiler.version)
-        args.append('-DARB_CXX_FLAGS_TARGET='+opt_flags)
+        opt_flags = self.spec.target.optimization_flags(
+            self.spec.compiler.name,
+            self.spec.compiler.version)
+        args.append('-DARB_CXX_FLAGS_TARGET=' + opt_flags)
 
         return args