- Makefile.in: Make sure that xotclsh + xowish are explicitly linked
  against libtclstub*.so, rather than libtcl*.so. Otherwise, building
  with --with-xotclsh + --with-xowish fails starting with 8.6 (which
  effectively hides the various stub structures in libtcl*.so).
- *AppInit.c: Use the stubbed variant of Tcl_Init().
- Tested under 8.6 (fossil trunk as of commit date) and 8.5 (fossil
  core-8-5-branch as of commit date).
- Thanks to Sergei Golovan (Debian Tcl/Tk Package Mantainers) for
  reporting the issue and an initial patch (see Debian bug #724816).
- remove obsolete test
- remove hard-coded "-rdynamic" from build of xotclsh and xowish
- follow modern autoconf conventions
- use TEA 3.9
- use new tcl.m4
- updated Changelog
- updated copyright dates
- added announce file for xotcl-1-6-8
- fixed typos in Changelog