Merge branch 'auxpow'

Upstream bitcoin/bitcoin#16426 reversed the lock
order between the wallet and cs_main.  In the name code, we had to
do the same updates in some places.

.travis.yml

@@ -128,7 +128,7 @@ jobs:
         FILE_ENV="./ci/test/00_setup_env_i686_centos.sh"
 
     - stage: test
-      name: 'x86_64 Linux  [GOAL: install]  [bionic]  [previous releases, uses qt5 dev package and some depends packages] [unsigned char]'
+      name: 'x86_64 Linux  [GOAL: install]  [bionic]  [C++17, previous releases, uses qt5 dev package and some depends packages] [unsigned char]'
       env: >-
         FILE_ENV="./ci/test/00_setup_env_native_qt5.sh"
 

README.md

@@ -41,7 +41,7 @@ information or see https://opensource.org/licenses/MIT.
 Development Process
 -------------------
 
-The `master` branch is regularly built and tested, but is not guaranteed to be
+The `master` branch is regularly built (see doc/build-*.md for instructions) and tested, but is not guaranteed to be
 completely stable. [Tags](https://github.com/namecoin/namecoin-core/tags) are created
 regularly to indicate new official, stable release versions of Namecoin Core.