Ignore latex8 PDF export tests

latex8.sty is obsolete and replaced by IEEEconf.
xypic workaround for avoiding an assertion (#8860)

The text should look the same.
Fix bug #8859: crash on alignment of two cells in tabular

The solution is the same as the other text-properties lfuns: use special loops when there is a multi-cell selection.
Revert "Do not kill the undo stack when doing a Save As..."

This commit was causing bug #8821.

This reverts commit 467422f9df784e2e6bab4f0cc8fcfbc166c59bd4.
Revert "Enable automake subdir-objects"

The reason for adding this option is to kill a warning with automake 1.14. However, the "make distclean" target does not work with the subdir-objects options for older versions of automake. To still allow older versions of automake, we remove this option and live with the warning when using automake 1.14.

This reverts commit 03343bd4e63f946b463fa4e97e70d449cadf6622.
Replace remaining autogenerated math icons.
Was forgetting these two icons.
NEWS: Update from the 2.0.x branch
NEWS: add what's new in LyX 2.1
Update ANNOUNCE for LyX2.1.0beta2
Update po/gmo files
Update layouttranslations
Update LFUNs.lyx
Fix EOLs
Remove obsolete code in Math.lyx

These workarounds are no longer necessary because of unicodesymbols
and further they break compilation with XeTeX as well as pdfTeX
with TeX input encoding set to ascii or utf8.

Thanks to Günter Milde for the fix.
Clarify instructions on how to set up the thesaurus (#8811)
One more clarification on the thesaurus setup
Clarify instructions on how to set up the thesaurus
ja: change default output format from pdf3 to pdf

dvipdfmx emits a lot of warnings and Koji suggests ps2pdf.
Thanks to Koji for the advice.

Note that on Debian, I installed the following packages
to be able to compile with ps2pdf:

fonts-takao-mincho
fonts-ipafont-nonfree-jisx0208
fonts-ipaexfont-mincho
Japanese docs: updates from Koji