RethinkDB 1.7.2

Closes #21320.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
juise 0.5.6

Closes #21308.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libslax 0.16.15

Closes #21307.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
beansdb 0.6

Closes #21299.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
portmidi: Tab.for_formula -> Tab.for_name
SUPPORTERS.md fixed some missing http://

some links like example.com were not clickable
in some markdown viewers.
bazaar: Printing python standard_caveats
PyQt5: PyQt5 for Qt5.