Made us not call get_avail_mem_size when it would just get overridden by the --cache-size option.
Made get_avail_mem_size try to use /proc/meminfo.
Made REG_UNCOMPILED be inside of scoped_regex_t.  It is used only internally.
Made some scoped_regex_t methods be in the .cc file.
Moved an include to scoped_regex.cc.
Moved meminfo parsing code to meminfo.hpp/cc.
Added error message if we could not parse /proc/meminfo.
Merge branch 'next' into sam_3193
Made some false uninitialized variable warning shut up.
Made /proc/meminfo stuff not even be declared/defined on OS X.
Merge branch 'next' into sam_3193
Merge branch 'sam_3193' into next
Made get_avail_mem_size also use vmstat.external_page_count so that file-backed pages are considered available.
Made get_avail_mem_size actually work on OS X, using HOST_VM_INFO64, host_statistics64, HOST_VM_INFO64_COUNT, instead of not working.
Merge branch 'sam_3193_mac' into next
Merge branch 'next' into sam_3238