force ignore of casper_library_bus.*

This library is generated on every startup using casper_library_bus_init.m
and so should be ignored.
Fanout control in bus_mult

The bus_replicate block now has the capability of adding pipeline
blocks with configurable latency to every replicated bus.

The bus_mult_init script now adds a replication layer consisting
of bus_replicate blocks just after input. The script calculates
the fanout for the inputs and replicates the inputs appropriately
to reduce this fanout to the maximum specified by the user.
clog message type check, performance improvement
reuse_block bug fix

block types were being compared in different ways so that
some block types were being replaced unnecessarily. logging
bug also fixed that passed cell array instead of char.