Anjuta IDE configuration
Fix bug - random crash when file is closed.

Crash is hard to reproduce, but it's mostly happen when CPU is busy. The reason is that there are several events run in parallel and one event destroys the object which is used by another event.
Synfig crashes with following message:
(synfigstudio:6885): glibmm-WARNING **: Glib::wrap_create_new_wrapper: Attempted to create a 2nd C++ wrapper for a C instance whose C++ wrapper has been deleted.

(synfigstudio:6885): glibmm-WARNING **: Failed to wrap object of type 'gtkmm__GtkTreeView'. Hint: this error is commonly caused by failing to call a library init() function.
Due to previous fix - no need for workaround anymore.
Disable workaround for revert function as well.
Update gitignore
Fix bug - random crash when file/application closed - second fix.
Fix on-close bug: Crash when file is closed and params panel is scrolled down.
Fix on-close bug: Crash when file is closed and child panel is scrolled down.
Revert "Fix on-close bug: Crash when file is closed and params panel is scrolled down."

This reverts commit e3edf4bff566b0d2b3ab0351ce2d4f42a3dd3bd0.
Revert "Fix on-close bug: Crash when file is closed and child panel is scrolled down."

This reverts commit 89de6490898ae8241ccb7addb7bac821ee7df131.
Different approach to fix on-close bug for Keyframes, Children and Params panels - fixes #151
Skeleton plugin: Move compensators out of "content" paste canvas.
Skeleton plugin: Set default transparency for skeleton elemnts.
Skeleton plugin: Fix initial orientation for contents of each bone.
Skeleton plugin: Disconnect hands and head from shoulders height.
Don't use Gtk::WINDOW_POPUP for "One Moment" message

From documentation:
gtk.WINDOW_POPUP is used to implement widgets such as gtk.Menu or tooltips that you normally don't think of as windows per se.