Our minimum version is now 0.2.9.5-alpha.  Series 0.3.0, 0.3.1,
0.3.2, 0.3.3, and 0.3.4 are now rejected.

Also, extract this version-checking code into a new function, so we
can test it.

Closes ticket 31549.

Also reject 0.3.5.0 through 0.3.5.6-rc as unstable.

It's good style to always add parentheses when using macro
arguments, in case somebody someday provides an argument that
contains an operator you don't expect, or causes the expression to
parse differently.

In Tor's tests, the tt_*() macros can call "goto done" on failure.
When that happens, we need to make sure that all of our allocated
memory still gets freed, or else Coverity will complain.

(I've chosen to suppress some instances rather than 'fix' them,
since the fix would require arrays or major refactoring.)

Fixes bug 31519; bug not in any released Tor.

no actual changes to the license.

this way folks who don't immediately recognize the text of the 3-clause
bsd can be reassured that we're using a standard license.

closes ticket #31498

Previously, v3 single onion services failed when all intro nodes were
unreachable via a 1-hop path. Now, we select intros that are only available
via a 3-hop path, and use a 3-hop path to connect to them.

Fixes bug 23507; bugfix on 0.3.2.1-alpha.