BUG: Fix parsing of linux 2.6 /proc/meminfo format
BUG: Fix parsing of linux 2.6 /proc/meminfo format

Previously KWSys SystemInformation parsed this file assuming a strict
order and set of fields, but the order is not reliable.  This
generalizes the implementation to support any order and extra fields.

chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys,chuckatkins/KWSys