typefindelement: Propagate input buffer PTS and DTS

The initial buffers (that were used for timestamping) might have PTS
and DTS set. In order to forward those properly, get the initial
PTS/DTS from the adapter and set them on the reconstructed output
buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=733291
baseparse: Return FLOW_FLUSHING when pushing a frame on a pad that has been flushed

When going to READY, it is possible that we are still pusing a frame but that
our srcpad has already been set to flushing. In that case we should not
post any error on the bus but instead cleanly return FLOW_FLUSHING.

https://bugzilla.gnome.org/show_bug.cgi?id=733320
po: Update translations
Update .po files
Release 1.4.0
Back to development
elements: improve buffer flags to string utility function

Avoid relocations and refactor so that we don't calculate
the fixed and known at compile time maximum string size
every time. Also skip the mini object flags which we are
not going to print anyway.
Miscellaneous leaks aimed for post 1.4