lalsuite_build: $CPLUS_INCLUDE_PATH needed a dollar sign
SWIG: add macros for ignoring members of structs
ComputeFstat: remove 'tagFstatResults' member 'internalalloclen' from SWIG wrappings
Segments: some minor changes

- use 'int' for error code return types instead of 'INT4',
  consistent with rest of LALSuite and XLAL spec
- whitespace cleanup
SWIG: improve wrapping of segment lists

- provide functions XLALSegListCreate() and XLALSegListFree() for
  creating dynamically-allocated segment lists for SWIG wrappings,
  XLALSegListFree() will be used as the destructor function
- ignore XLALSegListInit() function, internal LALSegList members,
  and some internal constants
Segments: do not hide XLALSegListInit() from SWIG wrappings

- function may be needed to e.g. initialise a segment list in a struct