* tcl.m4: New file.

    * tcl.m4: New file.
        * acinclude.m4: Include tcl.m4 instead of ../config/acinclude.m4
        * aclocal.m4: Regenerated.
        * configure.ac: Do not check for ITCL_SH.
        Use SC_PATH_TCLCONFIG, SC_PATH_TKCONFIG, SC_LOAD_TCLCONFIG, and
        SC_LOAD_TKCONFIG to find Tcl and Tk.
        Add some logic for when using in-tree Tcl/Tk.
        Change substitutes for TCL_BUILD_LIB_SPEC, TK_BUILD_LIB_SPEC, and
        TCLHDIR to accommodate using system-supplied Tcl and Tk.
        * configure: Regenerated.
        * Makefile.in: Regenerated.
        * library/Makefile.am: Replace ITCL_SH with TCLSH.
        Remove TCL_SHARED rules.
        (tclIndex): Update build rules.
        * library/Makefile.in: Regenerate.
        * library/balloon.tcl: Update for Itcl 3.2/3.3.
        * library/cframe.tcl: Likewise.
        * library/lframe.tcl: Likewise.
        * library/multibox.tcl: Likewise.
        * library/sendpr.tcl: Likewise.
        * library/ventry.tcl: Likewise.
        * library/wframe.tcl: Likewise.
        * src/Makefile.am (INCLUDES): Update.
        * src/Makefile.in: Regenerate.
        * src/paths.c (init_script): Accommodate builddir != srcdir.