readded and fixed #4781: new cache size nano (commit b300630 got lost)

compatibility:
- is supported by new OKAPI rev. 495
- Ocprop compatibility is being checked
- is returned as "other" size in XML interface size field, and as "nano" in new size2 field
- is returned as Micro in GPX files
readded and fixed #4781: new cache size nano (commit b300630 got lost)

compatibility:
- is supported by new OKAPI rev. 495
- Ocprop compatibility is being checked
- is returned as "other" size in XML interface size field, and as "nano" in new size2 field
- is returned as Micro in GPX files
resolved merge pseudoconflict
readded and fixed #4781: new cache size nano (commit b300630 got lost)

compatibility:
- is supported by new OKAPI rev. 495
- needs new Ocprop version
- is returned as "other" size in XML interface size field, and as
"nano" in new size2 field
- is returned as Micro in GPX files