Merge bitcoin#12261: qt: Bump BLOCK_CHAIN_SIZE to 200GB

ba490d2 qt: Bump BLOCK_CHAIN_SIZE to 200GB (Wladimir J. van der Laan)

Pull request description:

  Part of the release process for 0.16.

  Value is open for discussion, my blocks/ directory is 163GB but this leaves some slack.

Tree-SHA512: 4dff81740992bf9de90427934afeb223ea5216f5682c9f07cb5c47aea33980a4c682fe3fd43c3dfa2c4d66ad0e7434dbce6cb252e56d63b36df605e12af9b10a

src/qt/intro.cpp

@@ -22,7 +22,7 @@
 
 static const uint64_t GB_BYTES = 1000000000LL;
 /* Minimum free space (in GB) needed for data directory */
-static const uint64_t BLOCK_CHAIN_SIZE = 150;
+static const uint64_t BLOCK_CHAIN_SIZE = 200;
 /* Minimum free space (in GB) needed for data directory when pruned; Does not include prune target */
 static const uint64_t CHAIN_STATE_SIZE = 3;
 /* Total required space (in GB) depending on user choice (prune, not prune) */