Work around MSVC warning

The statement
	if (pos < from + lyxrc.completion_minlength)
triggers a signed vs. unsigned warning. I don't know why this happens, it
could be a MSVC bug, or related to LLP64 (windows) vs. LP64 (unix)
programming model, or the C++ standard might be ambigous in the section
defining the "usual arithmetic conversions". However, using a temporary
variable is safe and works on all compilers.
AEA.lyx: update format
Restore compilation of AEA template for TeX Live

After the previous change this document failed to compile under
TeX Live 2013 and 2014. By using a different bib file, it
compiles. For more information, see
  https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg183786.html
Update it.po
The flush should be done on either branch.
Fix memory leak and assignment operator signature

The IconvProcessor assignment operator did not delete pimpl_ and used a
non-standard signature. If you want to know why the standard signature is
important, read "Effective C++" by Scott Meyers.
Make IconvProcessor::Impl noncopyable

The compiler-generated copy-constructor and assigment operators would be wrong
for IconvProcessor::Impl, since cd would be copied, and iconv_close() could
thus be called twice on the same descriptor. The old code did work, but now
IconvProcessor::Impl cannot be copied by accident in the future.
ctests: un-invert some tests after updates

David Carlisle fixed some EuropeCV issues and other updates
on TeX Live 2014 fixed a few more exports.
Polyglossia now supports Austrian German
Babel now supports Swiss German
Add support for the sectionbox and tcolorbox packages.

They will be used by the conference poster classes that will be supported in a minute.
Support for conference posters

The following poster classes are now supported:

* a0poster
* beamerposter
* sciposter
Some comments
* sk.po: New poster strings
Add support for the pdfcomment package.

Fixes: #6975.
Document pdfcomment in LaTeXConfig.lyx
Corrected tooltip search string.

This worked wrong in case where the text contained the string 'tooltip' too.
* sk.po: New pdfcomment strings
Fix bug #9162: Missing \use_indices

The lyx2lyx conversion for format 352 was incomplete: It should have been
added the \use_indices setting, but it relied on the fact that the default in
LyX for missing \use_indices is the same as the old format without that
setting used. However, the default might change in the future, and later
lyx2lyx conversions rely on that setting as well.
Don't guess whether autosave succeeded

writeFile() tells whether it could save the file, so use the return value
instead of guessing.