Package mapsoft2: Information

- GeoJSON format: add extension for writing/reading maps. Now mapsoft2
  geodata structure can be stored in json without losses.
- SRTM layer: fix a few problems: parameter dialog, tile drawing,
  coordinate calculation, srtm_width file reading. Add GeoTiff support.
- Track layer: fix error in color setting. Adding new tracks in the viewer.
- Map layer: fix handling of map lists with multiple maps, fix a few
  problems with switching different viewer projections.
- Maps menu: use {/usr/share/,${HOME}/.}mapsoft2/maps_menu.json
  instead of hardcoded list of maps.
- ms2conv: --srtm option, --htm option. --name, --comm filters.
- Rendering raster images: --add,--title,--title_size options,
  Fix paths in map-files. Fix --mag option. Fix border handling for
  multiple maps.
- MapDB: change configuration file format for MP import/export
  (similar to VMAP import/export). Fix error in geohash calculation.
  Fix label rendering (scale max_text_size properly).
- ANSI escape sequences (\n, \t etc.) and empty words ("") in all
  configuration files (in read_words).
- Avoid throwing c++ exceptions through c code (in image/io_jpeg,io_tiff),
  remove ExcludeArch: armh.
- Fix difference between 32- and 64-bit systems (in image/image_remap).
- Add ms2img program: converting raster images with mapsoft2 libraries.

- viewer: fix a few problems with tiled maps, rescaling and bounding box setting;
  faster srtm layers.
- geodata rendering: fix border rendering, modify options for border setting.
  Allow rendering of tile sets.
- image/colors: fix color handling, add options for loading/saving colormaps.
- mapdb rendering: change reference, border, scale settings.
- spec: add /home/sla/mapsoft2ir /usr/share/mapsoft2 to files section

Viewer:
- SRTM data support (map layer, panoramic view, drowing options dialog)
- Tile map support, improve viewer geo-reference algorythms
- "Track drawing options" dialog
- "Show point information" dialog
- "Use map reference" action
Other:
- fix error with reading integer values from GeoJSON
- `SU` projection: Pulkovo CS with automatic zone number
- fix loading PNG images with depth<8