Work on major bug EXT-3985 ([BSI] Landmarks created in Viewer 2.0 show up with 1@ in Viewer 1.23.x)

-- implemented patch to remove LM prefixes from landmarks' names
*NOTE: It will be unnecessary after the first successful session in viewer 2.0.
Can be removed before public release.

Implementation details:
At the first run with this patch it patches all cached landmarks: removes LM sort prefixes and
updates them on the viewer and server sides.
Also it calls fetching agent's inventory to process not yet loaded landmarks too.
If fetching is successfully done it will store special per-agent empty file-marker
in the user temporary folder (where cached inventory is loaded) while caching agent's inventory.
After that in will not affect the viewer until cached marker is removed.

--HG--
branch : product-engine