fix error check (bb#637)
Print fraction part with truncated zeroes. Fix for bb#574
Check for sxi_curlev_init() errors. Fix for bb#586
Hold number of successfully finished jobs in sxi_jobs_t structure. Fix for bb#490.

Number of successful jobs is held globally for all jobs and therefore this number can be checked despite polling which can be needed to perform.
Remove unnecessary successful field from sxc_file_list_t.
Fix bad error message for empty remote path. Fix for bb#492.
don't use local cache with --host-list (bb#635)
remove sxhttpd with make uninstall (bb#631)
improve hdist tests
Return error code from user transfer callback. Fix for bb#636.

Return error code from sxc_xfer_callback() function to be able to abort
pending transfer.
Add context to sxc_xfer_stat_t structure.

Do not dereference NULL. Fix for bb#587