[ACT-R-users] Updated ACT-R 7 software

[db30 at andrew.cmu.edu]

The ACT-R 7 software available from the ACT-R website at
<http://act-r.psy.cmu.edu/software/> has been updated.  The
current version is now 7.5-<2244:2017-07-11>.

The two most notable changes are listed below.  More details are
available in the commit log found on the ACT-R website at:
<http://act-r.psy.cmu.edu/log/actr6log.txt>, but only the changes
in the actr7 branch are relevant to the current software.


A bug in the !bind! action of productions was fixed.  When used
on the RHS it was allowing a return value of nil to be bound to
the variable which caused problems for anything that then tried
to use that variable.  Now, if nil is returned to a !bind! on
the RHS it will print a warning about it and bind the variable
to the value t instead to avoid errors downstream.

The aural module was inconsistent in how it filled in the offset
and duration values for audio-event chunks in the aural-location
buffer.  Now, it always fills in those slots appropriately if the
corresponding sound ends while the chunk is still in the buffer.

If you have any questions or problems with the new version
please let me know.

Dan