Upgrade to version 3.1.4

This version improves the compatibility with the bc and dc in base under
two aspects:

1. Remove printing of the version and copyright message for interactive invocations of bc an dc.

2. Make dc exit after execution of commands passed via -e or -f. To get the behavior of version 3.1.3 back, "-f -" can be appended to the command line to read from STDIN until EOF.

Approved by: antoine (implicit)