Merge changes from topic "procrank-ready"

* changes:
  Add procrank2
  libmeminfo: defer maps reading only when required for procmeminfo
  libmeminfo: Add support to reset workingset without procmeminfo objects
  libmeminfo: Add support to fiter accounting based on page flags
  libmeminfo: Add support to read zram memory consumption
  libmeminfo: Add support for counting swap pages