Merge branch '1443_one_dir_copy_progress'
* 1443_one_dir_copy_progress:
Change param name from 'Layout.progressbar_always_left2right' to 'Layout.classic_progressbar'
Change progressbar dialog.
Added ability to show progressbars (when copy files) from right to left.
Added indication of total BPS and ETA for file operations.
Widget library: added new widget WHLine.
Show Count progress bar before copy/move of 1st file,Z not after.
copy_file_file(): create file copy buffer in stack instead of heap.
Type accuracy in file operation routines.
Reimplemented some gotos in panel_operate().
Ticket #1443: show average copying velocity/ETA for whole operation.