build: fix 'make distcheck'

Rather than treating the .py as a regular built test, run it from check-local
so that we can better control the paths used.
Adding RPC tests for the following wallet related calls: getbalance,
listsinceblock, listtransactions, listlockunspent, listaccounts
listaddressgroupings
Adopt style colour for button icons
Merge pull request #5493

9b7d3fb Adopt style colour for button icons (Luke Dashjr)
Fix typo
Fix reference.

The text talked about "Quit" while Bitcoin uses "Exit" in its menu.
Merge pull request #5558

99913f0 Fix reference. (Thomas Zander)
Merge pull request #5554

244fdc7 Fix typo (Julian Yap)
Merge pull request #5530

7c5dd60 Adding RPC tests for the following wallet related calls: getbalance, listsinceblock, listtransactions, listlockunspent, listaccounts listaddressgroupings (Everett Forth)
Merge pull request #5514

be43492 build: fix 'make distcheck' (Cory Fields)
rename checkwork
Merge branch 'master' of https://github.com/bitcreditscc/bitcoin