Bug 9639 - Replace YUI button on MARC tag structure toolbar with Bootstrap

Bug 9639 - Replace YUI button on MARC tag structure toolbar with Bootstrap

This patch converts the toolbar used on the MARC tag structure toolbar
to Bootstrap, replacing YUI button code with Bootstrap markup.

To test, view marctagstructure.pl for any framework. Confirm that the
'New tag' button looks correct and works correctly.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Confirmed that 'New tag' looks and works correctly.
No errors.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works nicely, no problems found.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>