Lowered LBA_READ_BUFFER_SIZE
Optimization of progress_app::handle() by using a shared pointer for the directory.

Conflicts:

	src/clustering/administration/http/progress_app.cc
Merge branch 'daniel_lower_lba_read_buffer_size' into next
Merge branch 'daniel_1660' into next
Adds missing `pluralize_noun`. Closes #1668.
Tweaks for GCC 4.4

Review 1039 by @mlucy
added samplers
whitespace
Merge branch 'next' into sam_1431
Made deserialize_from_group use guarantee_deserialization.
Changed deserialize_from_group deserialization error message.
Made guarantee_deserialization be a macro.  (Backtraces sometimes fail.)