Fix a crash bug introduced in 223d354e3.

Arma found this and commented on #11243.  Bug not in any released
version of Tor.
Congratulate relay operator when OR is first started

When Tor first generates identity keypair, emit a log message that
thanks for their participation and points to new Tor relay lifecycle
document.
Remove configure option to disable curve25519

By now, support in the network is widespread and it's time to require
more modern crypto on all Tor instances, whether they're clients or
servers. By doing this early in 0.2.6, we can be sure that at some point
all clients will have reasonable support.
Teach format_changelog.py to emit HTML.
Remove changes files that have already been merged in release-0.2.5

(This means that changes/* is now "everything that changed since
0.2.5.10".)
Start on an 0.2.6.1-alpha changelog

I concatenated the remaining changes/* files, removed them, made the
headings more uniform, then told format_changelog.py to sort,
collate, and wrap them.
Merge remote-tracking branch 'sebastian/bug13286'
Merge remote-tracking branch 'rl1987/feature10427'
Fix smartlist_choose_node_by_bandwidth() so that it rejects ORs with BadExit flag.
Updating message that warns about running out of sockets we can use.
Initial version of doc/TUNING.
Adding changes file for 9708.
Add another year to our copyright dates.

Because in 95 years, we or our successors will surely care about
enforcing the BSD license terms on this code.  Right?
Track down "bugfix on version" entries for 0.2.6.1-alpha changelog
Add in a few more changes entries for 0.2.6.1-alpha

(Also resort and rewrap)
Edit changelog entries for terseness and style.
a few more style fixes for the changelog
Reinvoke format_changelog.py

Also, tweak it so that it puts major deprecations and requirements
early in the changelog.
Add a draft blurb for 0.2.6.1-alpha
Make 0.2.6.1-alpha ChangeLog prettier.