- move CreateMetaTableDir.c to lalinspiral, the only lalsuite package that
  uses its contents.
- switch lalsuite's configure scripts' liblalmetaio link tests from
  checking for (the now removed) XLALCreateMetaTableDir() to
  XLALLIGOLwHasTable()
- remove some defunct LALStatus-style error codes from LIGOLwXMLRead.h
- fix prototype for XLALSearchSummaryTableFromLIGOLw()