(fixed) 2017-06-22 fix too many features makes timeout - divide transactions to smaller

Use
  1. http://procesy5.pl/procesy5-wfs-api-doc/getfeature___hits.html
  2. http://procesy5.pl/procesy5-wfs-api-doc/data_read_getfeature.html with:
    1. Limit - `count` (WFS 2.0.0) lub `maxFeatures` (for earlier WFS versions)
    2. Offset - : `startIndex`
To provide smaller several transactions read to be make for download data.