Update libtabe to 1.2.6.
While here, add DESTDIR support and relax bdb dependency from db3 to db2-4.

0.2.6: 2004/09/20
---------------------
1. Remove the "-release" flag from libtool, such that the naming convention
  of libtabe/libbims is changed to be: libtabe.so.X.X.X/libbims.so.X.X.X.
  Add release number information into utilities.
  Thanks to Roger So <roger.so@sw-linux.com>.

2. Porting to DB3-3.3.11: DB->stat() only takes 3 arguements.
  Thanks to Pofeng Lee <informer@ns1.m2000.idv.tw>
    Rui-Xiang Guo <rxg@ms25.url.com.tw>

3. Change the "rm $(PACKDB)" from "make clean" to "make distclean".
  Thanks to Kuang-che Wu <kcwu@ck.tp.edu.tw>.

4. Fix several memory leakage problem.
  Thanks to Kuang-che Wu <kcwu@ck.tp.edu.tw>.

5. Add util/tsiguess.c.
  Add API: tabeChunkInfoFree(), tabeChunkInfoNew(), tabeTsiInfoNew(),
    tabeTsiInfoFree().
  Thanks to Pofeng Lee <informer@ns1.m2000.idv.tw>.

6. Add bims facility: user add Tsi by hand and store to user DB files.
  Thanks to Eric Cheng <eric@fractal.myip.org>.

7. Add bims facility: simple algorithm to learn new phrase input by user.
  Thanks to Pofeng Lee <informer@ns1.m2000.idv.tw>.

8. A quick fix for segfault when there is no ~/.xcin/*.db
  Fixed by Geoffrey Lee <snailtalk@linux-mandrake.com>

9. Fixed the bug of signed/unsigned TsiInfo->refcount ( 亨�W 0 bug )
  Found by FixeShao-yu Cheng <eric@netgenes.org>
  Fixed by Kuang-che Wu <kcwu@ck.tp.edu.tw>

10. By <thhsieh@linux.org.tw>
    Fix a bug in libtabe/util/tsiguess: Do not always try to open
    $HOME/.xcin/newdb. But one can use the flag "-u" to specify the
    path of user defined DB file.

11. Fix bug in tabe_tsi.c: tabeChunkSegmentationComplex():
    the same floating point number precision problem found in bims.c.
    Speed up and clean up tsiguess.c and tabe_tsi.c
    By Kuang-che Wu <kcwu@ck.tp.edu.tw>

12. Set DB_FLAG_READONLY or DB_FLAG_NOUNPACK_YIN flags in
    tsidump, tsiguess, tsiyincheck, tsiyindump utilities when necessary.
    By Kuang-che Wu <kcwu@ck.tp.edu.tw>

13. Support Berkeley DB 4.
    Thansks to Cheng-Lung Sung <clsung@dragon2.net>.

14. Builds without libbims if configure --without-x
    Builds with specific BerkeleyDB lib name if configure --with-db-name
    tsipackdb.in try all db*_dump, don't check db version anymore

15. Add bimsToggleTsiGuess() and bimsToggleNoTsiGuess() functions.
    Update autotools files.

(obache)