Rewrite ui_showfields() and ui_putitem().
Rewrite ui_showfields() and ui_putitem().

New more efficient implementation that don't even use stripesc() which has also
been removed. This commit also fixes two bugs about NUL-termination of names in
viewdb() and viewtable_show(). Lastly, the MYSQLIDLEN constant has been added,
which identify the MySQL max length for both table and db names.

clamiax/myadm