release notes: command line option is spendzeroconfchange

nospendzeroconfchange is valid as well on the command line,
but confusion about the name of the option was causing people to do things like
nospendzeroconfchange=0/1.
Update docs about boost on unix
Revert "Squashed 'qa/rpc-tests/python-bitcoinrpc/' content from commit e484743"

This reverts commit 260cf5c0a4754be39b05f6a247b8a354de7eced6.

Rebased-From: da0b9d4
build: fix explicit --disable-qt-dbus

It worked in the auto/yes cases, but an explicit disable actually forced
it on.

Rebased-From: a22e9a3
Protocol changes for Dogecoin 1.5

ported over from Dogecoin and Litecoin

(cherry picked from commit 8b09dad2d506fc5a6239863b1c0e33bf7e84da00)
fixing previous commit

(cherry picked from commit 7f6b9903cb1275663106247689e1c1f0ab4007c8)
fix makefile

(cherry picked from commit 3c870579107976d6b8f8bd7775a0948e5138fb77)
updated to Dogecoin 1.6 protocol

(cherry picked from commit d6dbaf412e2331426d5012d1c10b7749b6821b82)
Update README.md
(cherry picked from commit ba1bf566b1007a896f69d45dfdfc7c236c4640fc)
fix regtest network

(cherry picked from commit 86bf022cb3a0439bc9b17a915aceedf727f144a3)
additional Dogecoin 1.6 protocol change

(cherry picked from commit 650ec89e251e1201479d75f79ac520f278a50c40)
credit where credit is due

(cherry picked from commit 5cdcfa9a2b445dd8f8009f6ff3a8ded4ee6515e6)