[seiscomp, scanloc] Install, add .gitignore

lib/python/seiscomp3/__init__.py

@@ -0,0 +1,19 @@
+import os
+import sys
+import warnings
+
+sys.setdlopenflags(os.RTLD_LAZY | os.RTLD_GLOBAL)
+
+# Since Python 3.2 DeprecationWarnings are ignored by default. Since Python 3.7
+# DeprecationWarnings are shown when triggered directly by code in __main__.
+# We enable DeprecationWarnings again unless warning options have been specified on the
+# command-line, e.g., -Wignore.
+if not sys.warnoptions:
+    warnings.simplefilter("default", category=DeprecationWarning)
+
+warnings.warn(
+    "The SeisComP3 python API compatibility layer is deprecated and will be removed "
+    "with SeisComP 7. Change your imports from 'seiscomp3' to 'seiscomp'.",
+    DeprecationWarning,
+    2
+)