5.3.1.0-leisure

[5.3.1.0] 2021-04-04, leisure

This leisure release is part of the "Ingrid" milestone and contains a number
of important fixes. It is highly recommended to upgrade as soon as practicable.

Some highlights:

1. The beacon renewal chain walker fix (#2054) corrects a potential stall on restart
   if the accrual directory is rebuilt.

2. Beacons are not supposed to be auto-renewed during the scraper active period to
   prevent problems with magnitude for renewed beacons on the following superblock. We
   actually saw this, where a researcher lost magnitude on the following superblock (only)
   due to a renewal that occurred while the scrapers were active, and traced it to an
   incorrect guard on the renewal. #2090 and #2092 fix this problem.

3. Checkpoint based spam protection has been reimplemented (#2084) and we are now
   verifying hardened checkpoints on startup to catch some forked wallets better.

4. Several GUI improvements, including better researcher status while out-of-sync to
   prevent confusion (#2068), and an update to translations.

5. Memory optimization for the beacon db to "passivate" unneeded beacon elements from
   memory.

6. Implementation of a new getburnreport RPC function.

The next release should have the requested "sync-from-zero" menu option to complement
the "snapshot download" option already present.

Enjoy!

[5.3.1.0] 2021-04-04, leisure

Added

• doc: Invite users to donate to Gridcoin Foundation #1997 (@smoe)
• rpc: Add "getburnreport" RPC function #2049 (@cyrossignol)
• gui: Add stats export reminder to beacon wizard auth page #2050 (@cyrossignol)
• doc: Add undocumented "-showorphans" GUI option to help text #2058 (@cyrossignol)
• beacon: Cull beacon db memory (passivation) #2069 (@jamescowens)
• gui: Avoid refreshing GUI researcher status while out-of-sync #2068 (@cyrossignol)
• consensus: Reimplement checkpoint-based spam protection #2084 (@cyrossignol)
• consensus: Verify hardened checkpoints on start up #2087 (@cyrossignol)

Changed

• test: autogenerate data headers #2030 (@div72)
• doc: Change copyright years to 2021 #2042 (@caraka)
• gui: Clarify overview page "stake" field #2056 (@cyrossignol)
• doc: Update Copyright headers #2059 (@barton2526)
• gui: Update Qt Linguist localization files #2063 (@cyrossignol)
• build: update dependencies #2064 (@barton2526)
• net: Reduce default connection limit back to 125 #2066 (@cyrossignol)
• build: openssl patch #2074 (@barton2526)
• translation: Translate /src/qt/locale/bitcoin_en.ts in pt_PT #2083 (@DjMVeiga)
• log: Adjust logging #2076 (@jamescowens)
• gui: Change scraper tab to Inconsolata monospace font #2085 (@jamescowens)
• researcher: Change beacon deferment fix to reference nActiveBeforeSB #2092 (@jamescowens)

Removed

• net: Clean up mandatory protocol version transition #2080 (@cyrossignol)
• refactor: Remove LessVerbose() function #2089 (@cyrossignol)

Fixed

• build: Fix depends cross-compilation for macOS #2038 (@cyrossignol)
• build: Deal with Qt depends .qmake.stash file #2048 (@cyrossignol)
• beacon: Fix a subtle error in renewal chain walker #2054 (@jamescowens)
• researcher: Fix "malformed CPID" status for some pool projects #2052 (@cyrossignol)
• lint: Misc Typos #2060 (@barton2526)
• lint: remove identified duplicate includes #2061 (@barton2526)
• gui: Fix splash screen block height progress #2057 (@cyrossignol)
• gui: Fix garbage placeholders in some tx notification localizations #2070 (@cyrossignol)
• build: Patch libzip to fix mingw compile regression for mingw 9.2+ #2082 (@jamescowens)
• gui: Fix shutdown response for failed core init #2088 (@cyrossignol)
• researcher: Fix deferment of beacon renewal in superblock window #2090 (@cyrossignol)
• gui: Fix typo in beacon status refresh #2091 (@div72)