easier to leave it running unattended for large updates. (This can be
toggled off.)
2. Implemented a completely unattended mode which accepts the defaults for
all portmaster dialogues. (Note, this does not help with ports that have
interaction other than 'make config', such as ghostscript, etc.)
3. Added -u to sort(1) calls to try and address a bug report about duplicate
lines in +REQUIRED_BY files. I was not able to reproduce this bug, but
better safe than sorry.
4. Verbose mode is now slightly more informative about what's happening.
5. More common code factored out into functions.
6. The -n flag now cancels the build of the port called on the command line too.
7. Improved (?) the stale distfile deletion routine to better handle ports
that have multiple distfiles.
8. We now launch 'make checksum' (which performs a fetch if needed) in the
background while recursing through dependencies.
9. Various code cleanups, such as adding -t to a mktemp invocation that was
missing it, more local variables in functions, more consistent flag variable
values, etc.
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