Stringprep implementation for ejabberd

tools/uni_parse.tcl and tools/uni_parse2.tcl are based on tools/uniParse.tcl
from Tcl distribution, and they generate c_src/uni_data.c and
c_src/uni_norm.c.  Those files are distributed under BSD-style Tcl/Tk license
(see LICENSE.TCL).

The rest of the code is under GPL version 2 or above.