Fix pkg set -o
Improve error message
Fix typo
Move definitions to specific header.
Move priorities management to pkg_universe.
Move more code.
Split universe handling function.
Fix jobs processing.
Add find utilities.
Rework candidates selection.
Fix cudf module.
Rework conflicts.
Rename pkg_conflicts as it is jobs part.
More rework.
Fixes for jobs code.
Refactor names.
Return an error if failure were found, this fixes periodic script not sending mail

Reported by:	wblock
Fix progress bars when not in a tty to give output
Ignore sigpipe to avoid resources leak.
Read lock is now no-op unles READ_LOCK option is turned on.