Changelog:

• multi_type_vector: switched to using binary search on block position lookup, which significantly improves element access performance in general, at the expense of slight performance degradation on block shifting.

Signed-off-by: Martin Reboredo <gc1000ll@gmail.com>

Opened and edited *.odt (with math formulas), *.odp, *.odg and *.ods files in Libreoffice.