add docs to install target
Fixes Issue 11222 - isNumeric should return false on -/+ as a single character.
Merge pull request #1627 from AndrejMitrovic/Fix11222

Issue 11222 - isNumeric should return false on -/+ as a single character
Merge pull request #1610 from WalterBright/fix-install

add docs to install target
tweak unicode_tables.d and related code to avoid CTFE in generated tables
reduce redundnant imports
Merge pull request #1632 from blackwhale/faster-compile

Speed up compilation of std.internal.unicode_tables