Ran update_casper_library_links on CASPER libs

Saved in Simulink 7.2 format (aka 'R2008b').
Add semicolons to make some vacc masks quieter
Explicitly set position in register_mask

For some reason, explicitly setting the register block's position in the
register mask is needed to prevent the block's connections from becoming
disconnected (at least in Matlab 7.11.1 (R2010b Service Pack 1).
Use forwarding table in update_casper_block

casper_library's forwarding table maps old (now very old) block names to new
block names.  It is used automatically with add_block, but not with get_param.
Because the source block name that update_casper_block passes to get_param may
be very old, update_casper_block must explicitly map it to the new name, if
applicable.

To accomplish this, the casper_library_forwarding_table.m function has been
updated.  If given no parameters, it still returns a cell array suitable for
storing as casper_library's ForwardingTable.  If it is given a block name, it
returns the current name for that block name.  If the name is an old name in
the forwarding table, the new name will be returned; otherwise the name passed
in will be returned unchanged.
updated quadc pcore.

Now outputs clk180 and clk270 signals from DCM for use by other
yellow blocks (e.g. qdr_controller).
Copy ROACH quadc updates to ROACH2
Make multiplier_specification more robust

Previosuly, multiplier_specification displayed an error dialog and bail out if
the desired number of specifiers was not given.  Now that situation is handled
more gracefully by defaulting any missing specifiers to "Use HDL" and ignoring
any extra specifiers.  In either of these two cases, a warning message is
printed.

All uses of multiplier_specification have also been changed so that the
specific block being configured is passed in as the caller rather than mask
init script that multiplier_specification is being called from.  This will make
the warning messages more informative without sacrificing the calling function
info since that's already available in the warning message's backtrace.
Merge commit '4dfadff'

Used -s octopus -X ours to keep our FFT changes. multipliers, twiddle need to
be updated and then converted to R2008b. Removed downconverters as now drawn by
script.

Conflicts:
	casper_library/casper_library_downconverter.mdl
updated library blocks and R2008b conversion

The multipliers and twiddle subsections needed updating and conversion.
Merge branch 'adc16-branch' of http://astro.berkeley.edu/~davidm/mlib_devel