New waveforms interface

Description

Incorporates the new waveforms interface.

Support calling C and python waveform models from C and python clients.

The standard functions XLALSimInspiralChooseFD(TD)Waveform and XLALSimInspiralChooseFD(TD)Modes remain backwards compatible.

New C functions have been added XLALSimInspiralGenerateFD(TD)Waveform(Modes) which replicate the old ones and support a more flexible input of the parameters. Equivalent functions exist for the python interface.

The LALSuite build system has been modified to support embedded python.

See here for a brief introduction on the new waveforms interface.

API Changes and Justification

Backwards Compatible Changes

• This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions
• This change adds new classes/functions/structs/types to a public C header file or Python module

Backwards Incompatible Changes

• This change modifies an existing class/function/struct/type definition in a public C header file or Python module
• This change removes an existing class/function/struct/type from a public C header file or Python module

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

Review chaired by @vijay.varma and @sascha.husa. Review wiki, review repo The review statement for the first stage of reviews is here.

gnuscripts/lalsuite_swig.m4

@@ -2,7 +2,7 @@
 # lalsuite_swig.m4 - SWIG configuration
 # Author: Karl Wette, 2011--2017
 #
-# serial 116
+# serial 117
 
 AC_DEFUN([_LALSUITE_MIN_SWIG_VERSION],[
   # $0: minimum version of SWIG and other dependencies
@@ -669,6 +669,14 @@ EOD`]
     # allow addition of extra Python linker flags
     AC_ARG_VAR([EXTRA_SWIG_PYTHON_LDFLAGS],[Extra linker flags for SWIG Python bindings])
 
+    extra_swig_python_ldflags="-Wl,-flat_namespace"
+    AC_SUBST([extra_swig_python_ldflags])
+
+    LALSUITE_CHECK_LINK_FLAGS([
+      ${extra_swig_python_ldflags}
+      ],[EXTRA_SWIG_PYTHON_LDFLAGS="${EXTRA_SWIG_PYTHON_LDFLAGS} ${flag}"]
+    )
+
     # check for Python and NumPy headers
     LALSUITE_PUSH_UVARS
     CPPFLAGS="${SWIG_PYTHON_CPPFLAGS}"