+ added lt_db_set_datadir() and lb_db_get_datadir() functions to point to
liblangtag data and override REGDATADIR define
- removed LIBO_LANGTAG_DATADIR environment variable hack
* LIBO_LANGTAG_DATADIR environment variable may point to liblangtag data and
override REGDATADIR define.
* deliver data files to $SOLARVER/$INPATH/share/liblangtag