support of encryption keys in modify file tasks
rework psync_timer_wait_next_sec, hopefully will not crash on Win
Merge branch 'master' of git.mobileinno.com:pclsync into crypto
fix psync_get_upload_checksum to return bad api connections (it was possible to enter endless loop of bad api connection going to cache again and again)
crypto progress, working implementation of modifying encrypted files, remaining to implemenet for full crypto: ftruncate