vtl: remove inadvertently committed CURLERRORDEBUG
possible fix for #5441 -- ardour hangs on shutdown (trying to stop harvid/xjadeo)
enable videotimeline by default
option to ignore feedback detection - /i know what i'm doing/ mode.

This currently only has effect if the loop connection is
made/unmade while the option was set/unset.
Toggling the option itself won't trigger a graph re-order
Revert "option to ignore feedback detection - /i know what i'm doing/ mode."

This reverts commit e17f75b351356279778e4ea4adbb6c0d544ba755.
update linux packaging script to include xjadeo & harvid
add script to install video-tools
refine video-tools installer:

* arch/platform detection
* curl progress-bar
redesign toggling of editor/mixer stacking to use Gtkmm2ext::VisibilityTracker
Revert "fix LXVST support for plugins that make audioMaster callbacks from
within effOpen (e.g. glitch)"

This patch broke just about all other LVXST plugins. Glitch is doing something
wrong, or there is more magic about VST that we have yet to understand.

This reverts commit 56bc98f78bd3b1e5ba5c6ce902b2805d40a6cc53.
zero/reset closed file-descriptors

should fix issues with LinuxDSP plugins (X11 thread) & xjadeo
don't print stacktraces to the supplied ostream AND cerr - a remnant from debugging wierd problems with stacktrace() on paul's system
fixups for building on OS X where apple define silly macros
cleanup AU GUI support, which was broken because prefheight and prefwidth were left unset after a cleanup attempt some months ago. add a few more tweaks based on current 2.x code and some tricks found elsewhere that dont' change behaviour but are just better
fix version detection in OSX build script
remove unnecessary sigc++ header
improve relationship between ArdourDialog and Splash on OS X, where window restacking doesn't really work the way we need it to. more complex than anticipated because it seems that destroying a Gtk::Dialog does not emit its hide() or unmap() or unmap_event() signals
forward port recent mixbus change so that side-scroll is now shift-wheel and height adjustment is alt-wheel, rather than vice versa, to match OS X convention
vtl: remove inadvertently committed CURLERRORDEBUG
possible fix for #5441 -- ardour hangs on shutdown (trying to stop harvid/xjadeo)