py-pybigwig: fix build with python3, add numpy variant (#10444)

* added patch to correctly pick up non-system curl when building
  with Python 3
* added numpy variant
* add version 0.3.12
* update checksums to sha256

var/spack/repos/builtin/packages/py-pybigwig/package.py

@@ -12,7 +12,15 @@ class PyPybigwig(PythonPackage):
     homepage = "https://pypi.python.org/pypi/pyBigWig"
     url      = "https://pypi.io/packages/source/p/pyBigWig/pyBigWig-0.3.4.tar.gz"
 
-    version('0.3.4', '8e0a91e26e87eeaa071408a3a749bfa9')
+    version('0.3.12', sha256='e01991790ece496bf6d3f00778dcfb136dd9ca0fd28acc1b3fb43051ad9b8403')
+    version('0.3.4',  sha256='8c97a19218023190041c0e426f1544f7a4944a7bb4568faca1d85f1975af9ee2')
+
+    variant('numpy', default=True,
+            description='Enable support for numpy integers and vectors')
+
+    patch('python3_curl.patch', when='@:0.3.12 ^python@3:')
 
-    depends_on('py-setuptools', type='build')
     depends_on('curl', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+
+    depends_on('py-numpy', type=('build', 'run'), when='+numpy')

var/spack/repos/builtin/packages/py-pybigwig/python3_curl.patch

@@ -0,0 +1,13 @@
+diff --git a/setup.py b/setup.py
+index ec31f9b..02c0320 100755
+--- a/setup.py
++++ b/setup.py
+@@ -40,7 +40,7 @@ except:
+     defines.append(('NOCURL', None))
+     sys.stderr.write("Either libcurl isn't installed, it didn't come with curl-config, or curl-config isn't in your $PATH. pyBigWig will be installed without support for remote files.\n")
+ 
+-foo = foo.strip().split()
++foo = foo.decode().strip().split()
+ for v in foo:
+     if(v[0:2] == "-L") :
+         additional_libs.append(v[2:])