publish build logs (so, presumably, someone can fix build errors).
* src/tools/build-nightlies
Use popen2.popen4() instead of os.system() so we can capture stdout
and stderr from the build and drop that into a log file. Wrap the
build of the post-build arranging stuffs in a big try/except
statement so we don't fall over at the slightest problem. Show all
the attempted locales in the output, with unsuccessful ones stating
as much and providing a link to the build log.
(SKIP_LOCALES, SKIP_PDF_LOCALES): Were skip_locales and
skip_pdf_locales, respectively. Move close to the top of the file.
