An oversight in the TTY defaults caused bc to reach an assertion failure
when it tried to set up raw mode for printing the history.
Now that this is fixed, we can finally enable history handling.
We may need entries with spaces in makeopts, installopts, and
configopts, and at that point we should also convert depends and
auth_opts to avoid confusion.
* Use ${version} instead of explicit version numbers in urls/filenames
* Move -L option to port script, as this is always good
* Fix some various other stuff
