* 'develop' of https://github.com/ONLYOFFICE/core:
  .
  OdfFormatReader - fix spreadsheets margins PptFormatReader - fix previous users picture, fix read picture stream version up
  XlsFormat - convert pivot tables
  debug
  .
  .

PptFormatReader - fix previous users picture, fix read picture stream
version up

v4.4.1

Feature/lenas fixies

* 'develop' of https://github.com/ONLYOFFICE/core:
  XlsFormat - convert pivot tables view
  Added scripts for fetching and building curl
  Removed curl sources
  refactoring
  refactoring
  XlsFormat ...
  XlsFormat ...
  .
  .
  .
  .
  min command length
  XlsFormat - convert piot cache
  x2t - return error code by PptConvert
  memset before readlink.