Silence LAL SWIG stdio and matplotlib font-manager noise on import

LAL enables SWIG stdout/stderr redirection under IPython/Jupyter, which
carries a performance penalty and prints a "Wswiglal-redir-stdio" warning.
Disable it on import via LAL's own swig_redirect_standard_output_error(False);
set PYCBC_LAL_SWIG_REDIRECT_STDIO to keep LAL's native behaviour.

Also raise the matplotlib.font_manager logger to WARNING so its flood of
DEBUG "findfont: ..." records (tens of thousands per figure) no longer swamps
the output of pycbc tools run with --verbose.

Author: ahnitz

pycbc/__init__.py

@@ -29,7 +29,20 @@
 # Filter annoying Cython warnings that serve no good purpose.
 warnings.filterwarnings("ignore", message="numpy.dtype size changed")
 warnings.filterwarnings("ignore", message="numpy.ufunc size changed")
+
+# Disable LAL's SWIG stdio redirection (and its "Wswiglal-redir-stdio" warning
+# under IPython) by default. Set PYCBC_LAL_SWIG_REDIRECT_STDIO to keep it.
+if not os.environ.get("PYCBC_LAL_SWIG_REDIRECT_STDIO"):
+    try:
+        import lal as _lal
+        _lal.swig_redirect_standard_output_error(False)
+    except ImportError:
+        pass
+
 import logging
+
+# Silence font_manager's DEBUG "findfont: ..." spam under --verbose.
+logging.getLogger("matplotlib.font_manager").setLevel(logging.WARNING)
 import random
 import string
 import importlib.util