0.22.3
=======
- Various crash and bug fixes
- Rework mouse selection to be more robust.  In particular, PRIMARY selection
 now only changes when mouse button is released, not upon every motion when
 selecting.
- Interpret and document negative number of scrollback lines as infinite
- Bugs fixed in this release:
   Bug 597604 - assertion failed: (_vte_ring_contains (ring, position))
   Bug 598124 - The selection does not only change when the mousebutton is released
   Bug 598090 - LMB Mouse up event not registered when opining context popup menu
   Bug 587463 - "select all"+copy from gnome-terminal includes lines no longer in scrollback
   Bug 585370 - Incomplete disabling of python
   Bug 597242 - libvte color and cursor glitches
   Bug 591648 - Don't clear the screen when switching to the alternate screen
   Bug 569184 - vte generates unnecessary ioctl(I_FIND) kernel warnings
   Bug 599444 - Scrollback index type mess
   Bug 598814 - text.getText(0, -1) triggers assertion in vteaccess.c
   Bug 596739 - Python bindings leak memory
   Bug 597165 - void return in vte.c
   Bug 587894 - the environment passing with python does no longer work