omindex.cc: Note default size limit on files to index is unlimited.
Update --help to reflect that --sample-size now accepts the same
formats as --max-size).

git-svn-id: file:///home/xapian-svn/xapian/trunk@16986 6b2f1b92-a4f3-0310-943f-de3cbe41748b
commonhelp.cc: Tweak wording about default to match other options
better.

git-svn-id: file:///home/xapian-svn/xapian/trunk@16987 6b2f1b92-a4f3-0310-943f-de3cbe41748b
Makefile.am,docs/omegascript.rst,omindex.cc,query.cc,sample.cc,
sample.h: Add $truncate command to break a string after a word.

git-svn-id: file:///home/xapian-svn/xapian/trunk@16988 6b2f1b92-a4f3-0310-943f-de3cbe41748b
common/safesyssocket.h: On Linux at least, sometimes SOCK_CLOEXEC is
defined but the kernel doesn't handle it in socketpair(), so add a
wrapper which will retry without SOCK_CLOEXEC in this case.  Noticed
on Ubuntu precise.

git-svn-id: file:///home/xapian-svn/xapian/trunk@16990 6b2f1b92-a4f3-0310-943f-de3cbe41748b