[*] Changes to work with mempool list have been ported to develop.

See merge request !1465

(cherry picked from commit e0babc51)

ccee185c [*] Changes to work with mempool list have been ported to develop.
13483043 [*] Port from commits 67b819d3
40683829 [*] Port from commit be4df969
16a905bd Merge remote-tracking branch 'origin/develop' into ported_mempool-list