merge in the fix for template_verifier which avoids multiple
concurrent builds from stomping on each other.

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.

export source now detects the prefix rather than assigning it based on filename. fixed up some comments to match our coding standard. added ability to set default license on export which will be useful for the next source drop. SL-56607

Added much more error-recovery logic to template-verifier -- e.g. it retries a few times to fetch the master from the web.  Also I changed the master to live in the system global tempdir, mostly because the build machines had a network problem and I wanted to reduce the chance of that happening.  Not reviewed, but I'm checking it in over the weekend so I can silently fix it if there's yet another weird configuration difference that breaks it on the build machines.

SL-49406: template_verifier.py requires network access to build.  Implemented a 4-hour cache so it hits the network less often overall (saving approx .5 seconds every build), and added fault tolerance for when it fails to fetch the master over the network.  It'll whine at you if it can't fetch it, but even if it can't get the master from the network and doesn't have a cached copy at all, it will still at least do a syntax check on the local template.

Replaced usage of urlopen.read(), which isn't guaranteed to return all of the downloaded bytes, with urlopen.readlines(), which (I believe) does have that guarantee.  This should fix the rash of mysteriously-failing prebuilds.  In the process, added some better error messaging about whether the local template has the parse error, or the master on the network.  Also some reorganization.  Reviewed by Tess and Leyla.

Result of svn merge -r65183:65337 svn+ssh://svn/svn/linden/branches/python-shuffle into release. Also includes untabification of many python files.

svn merge --ignore-ancestry svn+ssh://svn/svn/linden/release@65088 svn+ssh://svn/svn/linden/branches/release-candidate@65078 -> release Paired by Tess and rdw.